735 lines
20 KiB
C++
735 lines
20 KiB
C++
/*--------------------------------------------------------------------------*
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*
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* Microsoft Windows
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* Copyright (C) Microsoft Corporation, 1992 - 1999
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*
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* File: msgview.cpp
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*
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* Contents: Implementation file for CMessageView
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*
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* History: 28-Apr-99 jeffro Created
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*
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*--------------------------------------------------------------------------*/
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#include "stdafx.h"
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#include "msgview.h"
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#include "util.h"
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using std::_MAX;
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using std::_MIN;
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/*+-------------------------------------------------------------------------*
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* CMessageView::CMessageView
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*
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*
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*--------------------------------------------------------------------------*/
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CMessageView::CMessageView ()
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: m_hIcon (NULL),
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m_yScroll (0),
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m_yScrollMax (0),
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m_yScrollMin (0),
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m_cyPage (0),
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m_cyLine (0),
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m_sizeWindow (0, 0),
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m_sizeIcon (0, 0),
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m_sizeMargin (0, 0),
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m_nAccumulatedScrollDelta (0)
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{
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/*
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* can't be windowless
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*/
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m_bWindowOnly = true;
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/*
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* get the system metrics we'll use
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*/
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UpdateSystemMetrics();
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DEBUG_INCREMENT_INSTANCE_COUNTER(CMessageView);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::~CMessageView
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*
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*
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*--------------------------------------------------------------------------*/
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CMessageView::~CMessageView ()
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{
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DEBUG_DECREMENT_INSTANCE_COUNTER(CMessageView);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::OnCreate
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*
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* WM_CREATE handler for CMessageView.
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*--------------------------------------------------------------------------*/
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LRESULT CMessageView::OnCreate (UINT msg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
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{
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CreateFonts();
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RecalcLayout ();
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return (0);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::OnDestroy
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*
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* WM_DESTROY handler for CMessageView.
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*--------------------------------------------------------------------------*/
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LRESULT CMessageView::OnDestroy (UINT msg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
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{
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DeleteFonts();
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return (0);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::OnSize
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*
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* WM_SIZE handler for CMessageView.
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*--------------------------------------------------------------------------*/
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LRESULT CMessageView::OnSize (UINT msg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
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{
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/*
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* The transient appearance/disappearance of WS_VSCROLL makes the client
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* rect volatile and can mess up our calculations. We'll use the more
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* stable window rect instead.
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*/
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WTL::CRect rectWindow;
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GetWindowRect (rectWindow);
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if (GetExStyle() & WS_EX_CLIENTEDGE)
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rectWindow.DeflateRect (GetSystemMetrics (SM_CXEDGE),
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GetSystemMetrics (SM_CYEDGE));
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WTL::CSize sizeWindow (rectWindow.Width(), rectWindow.Height());
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/*
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* if the overall size has changed, we have some work to do
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*/
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if (m_sizeWindow != sizeWindow)
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{
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/*
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* load m_sizeWindow right away so scrollbar future calculations
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* will have the right values in the member variable
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*/
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std::swap (m_sizeWindow, sizeWindow);
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/*
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* if the width has changed, we'll might need to recalculate
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* all of the text heights
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*/
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if (m_sizeWindow.cx != sizeWindow.cx)
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RecalcLayout ();
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/*
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* if the height changed, there's scrollbar work
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*/
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if (m_sizeWindow.cy != sizeWindow.cy)
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{
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int dy = m_sizeWindow.cy - sizeWindow.cy;
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/*
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* if the window's grown, we might need to scroll to keep the
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* bottom of our content glued to the bottom of the window
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*/
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if ((dy > 0) && (m_yScroll > 0) &&
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((m_yScroll + m_sizeWindow.cy) > GetOverallHeight()))
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ScrollToPosition (m_yScroll - dy);
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/*
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* otherwise, just update the scrollbar
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*/
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else
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UpdateScrollSizes();
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}
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}
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return (0);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::OnSettingChange
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*
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* WM_SETTINGCHANGE handler for CMessageView.
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*--------------------------------------------------------------------------*/
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LRESULT CMessageView::OnSettingChange (UINT msg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
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{
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if (wParam == SPI_SETNONCLIENTMETRICS)
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{
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DeleteFonts ();
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CreateFonts ();
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}
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UpdateSystemMetrics();
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RecalcLayout ();
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return (0);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::UpdateSystemMetrics
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*
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* Updates the system metrics used by the message view control.
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*--------------------------------------------------------------------------*/
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void CMessageView::UpdateSystemMetrics ()
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{
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m_sizeMargin.cx = GetSystemMetrics (SM_CXVSCROLL);
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m_sizeMargin.cy = GetSystemMetrics (SM_CYVSCROLL);
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m_sizeIcon.cx = GetSystemMetrics (SM_CXICON);
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m_sizeIcon.cy = GetSystemMetrics (SM_CYICON);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::OnKeyDown
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*
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* WM_KEYDOWN handler for CMessageView.
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*--------------------------------------------------------------------------*/
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LRESULT CMessageView::OnKeyDown (UINT msg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
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{
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return (0);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::OnVScroll
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*
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* WM_VSCROLL handler for CMessageView.
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*--------------------------------------------------------------------------*/
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LRESULT CMessageView::OnVScroll (UINT msg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
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{
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VertScroll (LOWORD (wParam), HIWORD (wParam), 1);
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return (0);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::OnMouseWheel
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*
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* WM_MOUSEWHEEL handler for CMessageView.
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*--------------------------------------------------------------------------*/
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LRESULT CMessageView::OnMouseWheel (UINT msg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
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{
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m_nAccumulatedScrollDelta += GET_WHEEL_DELTA_WPARAM (wParam);
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/*
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* scroll one line up or down for each WHEEL_DELTA unit in our
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* accumulated delta
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*/
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const int nScrollCmd = (m_nAccumulatedScrollDelta < 0) ? SB_LINEDOWN : SB_LINEUP;
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const int nScrollRepeat = abs(m_nAccumulatedScrollDelta) / WHEEL_DELTA;
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VertScroll (nScrollCmd, 0, nScrollRepeat);
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m_nAccumulatedScrollDelta %= WHEEL_DELTA;
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return (0);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::VertScroll
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*
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* Vertical scroll handler for CMessageView.
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*--------------------------------------------------------------------------*/
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void CMessageView::VertScroll (
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int nScrollCmd, /* I:how to scroll (e.g. SB_LINEUP) */
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int nScrollPos, /* I:absolute position (SB_THUMBTRACK only) */
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int nRepeat) /* I:repeat count */
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{
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int yScroll = m_yScroll;
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switch (nScrollCmd)
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{
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case SB_LINEUP:
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yScroll -= nRepeat * m_cyLine;
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break;
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case SB_LINEDOWN:
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yScroll += nRepeat * m_cyLine;
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break;
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case SB_PAGEUP:
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yScroll -= nRepeat * m_cyPage;
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break;
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case SB_PAGEDOWN:
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yScroll += nRepeat * m_cyPage;
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break;
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case SB_TOP:
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yScroll = m_yScrollMin;
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break;
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case SB_BOTTOM:
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yScroll = m_yScrollMax;
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break;
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case SB_THUMBTRACK:
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yScroll = nScrollPos;
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break;
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}
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ScrollToPosition (yScroll);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::OnDraw
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*
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* Draw handler for CMessageView.
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*--------------------------------------------------------------------------*/
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HRESULT CMessageView::OnDraw(ATL_DRAWINFO& di)
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{
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/*
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* use CDCHandle instead of CDC so the dtor won't delete the DC
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* (we didn't create it, so we can't delete it)
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*/
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WTL::CDCHandle dc = di.hdcDraw;
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/*
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* handle scrolling
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*/
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dc.SetViewportOrg (0, -m_yScroll);
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/*
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* set up colors
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*/
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COLORREF clrText = dc.SetTextColor (GetSysColor (COLOR_WINDOWTEXT));
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COLORREF clrBack = dc.SetBkColor (GetSysColor (COLOR_WINDOW));
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/*
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* get the clipping region for the DC
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*/
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WTL::CRect rectT;
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WTL::CRect rectClip;
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dc.GetClipBox (rectClip);
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/*
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* if there is a title and it intersects the clipping region, draw it
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*/
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if ((m_TextElement[Title].str.length() > 0) &&
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rectT.IntersectRect (rectClip, m_TextElement[Title].rect))
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DrawTextElement (dc, m_TextElement[Title]);
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/*
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* if there is a body and it intersects the clipping region, draw it
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*/
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if ((m_TextElement[Body].str.length() > 0) &&
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rectT.IntersectRect (rectClip, m_TextElement[Body].rect))
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DrawTextElement (dc, m_TextElement[Body]);
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/*
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* if there is an icon and it intersects the clipping region, draw it
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*/
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if ((m_hIcon != NULL) && rectT.IntersectRect (rectClip, m_rectIcon))
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dc.DrawIcon (m_rectIcon.TopLeft(), m_hIcon);
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/*
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* restore the DC
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*/
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dc.SetTextColor (clrText);
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dc.SetBkColor (clrBack);
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#define SHOW_MARGINS 0
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#if (defined(DBG) && SHOW_MARGINS)
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{
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HBRUSH hbr = GetSysColorBrush (COLOR_GRAYTEXT);
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WTL::CRect rectAll;
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WTL::CRect rectTemp;
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rectTemp.UnionRect (m_TextElement[Body].rect, m_TextElement[Title].rect);
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rectAll.UnionRect (rectTemp, m_rectIcon);
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rectAll.InflateRect (m_sizeMargin);
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dc.FrameRect (m_TextElement[Title].rect, hbr);
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dc.FrameRect (m_TextElement[Body].rect, hbr);
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dc.FrameRect (m_rectIcon, hbr);
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dc.FrameRect (rectAll, hbr);
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}
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#endif
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return (S_OK);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::SetTitleText
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*
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*
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*--------------------------------------------------------------------------*/
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STDMETHODIMP CMessageView::SetTitleText (LPCOLESTR pszTitleText)
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{
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return (SetTextElement (m_TextElement[Title], pszTitleText));
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::SetBodyText
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*
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*
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*--------------------------------------------------------------------------*/
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STDMETHODIMP CMessageView::SetBodyText (LPCOLESTR pszBodyText)
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{
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return (SetTextElement (m_TextElement[Body], pszBodyText));
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::SetTextElement
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*
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*
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*--------------------------------------------------------------------------*/
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HRESULT CMessageView::SetTextElement (TextElement& te, LPCOLESTR pszNewText)
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{
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USES_CONVERSION;
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tstring strNewText;
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if (pszNewText != NULL)
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strNewText = W2CT(pszNewText);
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if (te.str != strNewText)
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{
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te.str = strNewText;
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RecalcLayout();
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Invalidate();
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}
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return (S_OK);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::SetIcon
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*
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*
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*--------------------------------------------------------------------------*/
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STDMETHODIMP CMessageView::SetIcon (IconIdentifier id)
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{
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bool fHadIconBefore = (m_hIcon != NULL);
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if (id == Icon_None)
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m_hIcon = NULL;
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else if ((id >= Icon_First) && (id <= Icon_Last))
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m_hIcon = LoadIcon (NULL, MAKEINTRESOURCE (id));
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else
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return (E_INVALIDARG);
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/*
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* if we had an icon before, but we don't have one now (or vice versa)
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* we need to recalculate the layout and redraw everything
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*/
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if (fHadIconBefore != (m_hIcon != NULL))
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{
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RecalcLayout();
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Invalidate();
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}
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/*
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* otherwise, just redraw draw the icon
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*/
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else
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InvalidateRect (m_rectIcon);
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return (S_OK);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::Clear
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*
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*
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*--------------------------------------------------------------------------*/
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STDMETHODIMP CMessageView::Clear ()
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{
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m_TextElement[Title].str.erase();
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m_TextElement[Body].str.erase();
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m_hIcon = NULL;
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RecalcLayout();
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Invalidate();
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return (S_OK);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::RecalcLayout
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*
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*
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*--------------------------------------------------------------------------*/
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void CMessageView::RecalcLayout()
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{
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RecalcIconLayout();
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RecalcTitleLayout();
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RecalcBodyLayout();
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UpdateScrollSizes();
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::RecalcIconLayout
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*
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*
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*--------------------------------------------------------------------------*/
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void CMessageView::RecalcIconLayout()
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{
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m_rectIcon = WTL::CRect (WTL::CPoint (m_sizeMargin.cx, m_sizeMargin.cy),
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(m_hIcon != NULL) ? m_sizeIcon : WTL::CSize(0,0));
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::RecalcTitleLayout
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*
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*
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*--------------------------------------------------------------------------*/
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void CMessageView::RecalcTitleLayout()
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{
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WTL::CRect& rect = m_TextElement[Title].rect;
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/*
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* prime the title rectangle for calculating the text height
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* (leave room for a vertical scrollbar on the right so its appearance
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* and disappearance don't affect the layout of the text)
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*/
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rect.SetRect (
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m_rectIcon.right,
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m_rectIcon.top,
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_MAX (0, (int) (m_sizeWindow.cx - m_sizeMargin.cx - GetSystemMetrics(SM_CXVSCROLL))),
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0);
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/*
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* if there is an icon, leave a gutter between the icon and title
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*/
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if ((m_hIcon != NULL) && (rect.right > 0))
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{
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rect.left += m_cyLine;
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rect.right = _MAX (rect.left, rect.right);
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}
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/*
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* compute the height of the title
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*/
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if (m_TextElement[Title].str.length() > 0)
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rect.bottom = rect.top + CalcTextElementHeight (m_TextElement[Title], rect.Width());
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/*
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* if the title is shorter than the icon, center it vertically
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*/
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if (rect.Height() < m_rectIcon.Height())
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rect.OffsetRect (0, (m_rectIcon.Height() - rect.Height()) / 2);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::RecalcBodyLayout
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*
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*
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*--------------------------------------------------------------------------*/
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void CMessageView::RecalcBodyLayout()
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{
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WTL::CRect& rect = m_TextElement[Body].rect;
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/*
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* prime the body rectangle for calculating the text height
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*/
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rect.UnionRect (m_rectIcon, m_TextElement[Title].rect);
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rect.OffsetRect (0, rect.Height());
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/*
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* compute the height of the body; it starts empty, but adds the
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* height of the body text if we have any
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*/
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rect.bottom = rect.top;
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if (m_TextElement[Body].str.length() > 0)
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rect.bottom += CalcTextElementHeight (m_TextElement[Body], rect.Width());
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/*
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* if there's an icon or title, we need to leave
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* a line's worth of space before the body
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*/
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if (!rect.IsRectEmpty())
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rect.OffsetRect (0, m_cyLine);
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::CalcTextElementHeight
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*
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*
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*--------------------------------------------------------------------------*/
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int CMessageView::CalcTextElementHeight (const TextElement& te, int cx)
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{
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TextElement teWork = te;
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teWork.rect.SetRect (0, 0, cx, 0);
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DrawTextElement (WTL::CWindowDC(m_hWnd), teWork, DT_CALCRECT);
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teWork.font.Detach();
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return (teWork.rect.Height());
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}
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/*+-------------------------------------------------------------------------*
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* CMessageView::DrawTextElement
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*
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*
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*--------------------------------------------------------------------------*/
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|
|
|
void CMessageView::DrawTextElement (HDC hdc, TextElement& te, DWORD dwFlags)
|
|
{
|
|
/*
|
|
* use CDCHandle instead of CDC so the dtor won't delete the DC
|
|
* (we didn't create it, so we can't delete it)
|
|
*/
|
|
WTL::CDCHandle dc = hdc;
|
|
|
|
HFONT hFont = dc.SelectFont (te.font);
|
|
dc.DrawText (te.str.data(), te.str.length(), te.rect,
|
|
DT_LEFT | DT_TOP | DT_WORDBREAK | DT_NOPREFIX | dwFlags);
|
|
dc.SelectFont (hFont);
|
|
}
|
|
|
|
|
|
/*+-------------------------------------------------------------------------*
|
|
* CMessageView::CreateFonts
|
|
*
|
|
*
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
void CMessageView::CreateFonts ()
|
|
{
|
|
/*
|
|
* create a font that's a little larger than the
|
|
* one used for icon titles to use for the body text
|
|
*/
|
|
NONCLIENTMETRICS ncm;
|
|
ncm.cbSize = sizeof (ncm);
|
|
SystemParametersInfo (SPI_GETNONCLIENTMETRICS, 0, &ncm, false);
|
|
|
|
m_TextElement[Body].font.CreateFontIndirect (&ncm.lfMessageFont);
|
|
|
|
/*
|
|
* create a bold version for the title
|
|
*/
|
|
ncm.lfMessageFont.lfWeight = FW_BOLD;
|
|
m_TextElement[Title].font.CreateFontIndirect (&ncm.lfMessageFont);
|
|
|
|
/*
|
|
* get the height of a line of text
|
|
*/
|
|
SIZE siz;
|
|
TCHAR ch = _T('0');
|
|
WTL::CWindowDC dc(m_hWnd);
|
|
HFONT hFontOld = dc.SelectFont (m_TextElement[Title].font);
|
|
dc.GetTextExtent (&ch, 1, &siz);
|
|
dc.SelectFont (hFontOld);
|
|
m_cyLine = siz.cy;
|
|
}
|
|
|
|
|
|
/*+-------------------------------------------------------------------------*
|
|
* CMessageView::DeleteFonts
|
|
*
|
|
*
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
void CMessageView::DeleteFonts ()
|
|
{
|
|
m_TextElement[Title].font.DeleteObject();
|
|
m_TextElement[Body].font.DeleteObject();
|
|
}
|
|
|
|
|
|
/*+-------------------------------------------------------------------------*
|
|
* CMessageView::UpdateScrollSizes
|
|
*
|
|
*
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
void CMessageView::UpdateScrollSizes ()
|
|
{
|
|
WTL::CRect rect;
|
|
GetClientRect (rect);
|
|
|
|
int cyTotal = GetOverallHeight();
|
|
m_yScrollMax = _MAX (0, cyTotal - rect.Height());
|
|
|
|
/*
|
|
* The height of a page is a whole number of lines. If the window
|
|
* can display N lines at a time, a page will be N-1 lines so there's
|
|
* some continuity after a page up or down.
|
|
*/
|
|
if (m_cyLine > 0)
|
|
m_cyPage = rect.Height();// _MAX (0, ((rect.Height() / m_cyLine) - 1) * m_cyLine);
|
|
else
|
|
m_cyPage = 0;
|
|
|
|
|
|
/*
|
|
* update the scrollbar
|
|
*/
|
|
SCROLLINFO si;
|
|
si.cbSize = sizeof(si);
|
|
si.fMask = SIF_PAGE | SIF_RANGE | SIF_POS;
|
|
si.nMax = cyTotal;
|
|
si.nMin = m_yScrollMin;
|
|
si.nPage = m_cyPage;
|
|
si.nPos = m_yScroll;
|
|
|
|
SetScrollInfo (SB_VERT, &si);
|
|
}
|
|
|
|
|
|
/*+-------------------------------------------------------------------------*
|
|
* CMessageView::ScrollToPosition
|
|
*
|
|
*
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
void CMessageView::ScrollToPosition (int yScroll)
|
|
{
|
|
yScroll = _MIN (m_yScrollMax, _MAX (m_yScrollMin, yScroll));
|
|
|
|
if (m_yScroll != yScroll)
|
|
{
|
|
int dy = m_yScroll - yScroll;
|
|
m_yScroll = yScroll;
|
|
|
|
ScrollWindow (0, dy);
|
|
UpdateScrollSizes();
|
|
}
|
|
}
|