120 lines
3.7 KiB
C++
120 lines
3.7 KiB
C++
/*
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* Copyright (C) 2007 Ivan Cukic <ivan.cukic+kde@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License
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* version 2, or (at your option) any later version, as published by the
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* Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef PLASMA_NODE_LAYOUT
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#define PLASMA_NODE_LAYOUT
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#include <QtCore/QMap>
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#include <cmath>
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#include <plasma/plasma_export.h>
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#include <plasma/plasma.h>
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#include <plasma/layouts/layout.h>
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namespace Plasma {
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/**
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* Node layout has an advanced layouting mechanism. Every item's position
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* is defined by two nodes - one for top-left corner, and the other one for
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* bottom-right corner.
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*
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* Each node is defined by a pair of relative (xr, yr) and a pair of
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* absolute (xa, ya) coordinates. The calculated node coordinates depend
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* on the size and position of the NodeLayout object in the following
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* manner:
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* x = layoutLeft + (xr * layoutWidth) + xa
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* y = layoutTop + (yr * layoutHeight) + ya
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*
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* Alternatively, the item's position can be defined by using one node and
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* one pair of relative coordinates (xr, yr). In that case, the item is sized
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* following the sizeHint(). The relative coordinates (this time they are
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* relative to the item's geometry, not the layout's) specify what point of
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* the item will be bound to the defined node.
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*/
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class PLASMA_EXPORT NodeLayout : public Layout {
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public:
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class PLASMA_EXPORT NodeCoordinate {
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public:
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/**
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* Position is calculated:
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* x = parentLeft + (xRelative * parentWidth) + xAbsolute
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* y = parentTop + (yRelative * parentHeight) + yAbsolute
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*/
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NodeCoordinate(qreal xRelative = 0, qreal yRelative = 0, qreal xAbsolute = 0, qreal yAbsolute = 0);
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enum CoordinateType {
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Relative = 0,
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Absolute = 1,
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InnerRelative = 2 };
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static NodeCoordinate simple(qreal x, qreal y, CoordinateType xType = Relative, CoordinateType yType = Relative);
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float xr, xa;
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float yr, ya;
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};
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// reimplemented
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virtual Qt::Orientations expandingDirections() const;
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explicit NodeLayout(LayoutItem * parent = 0);
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virtual ~NodeLayout();
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QSizeF sizeHint() const;
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/**
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* Adds item at top-left corner, with automatic sizing
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* (using sizeHint of the item)
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*/
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void addItem (LayoutItem * item);
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/**
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* Adds item with specified top-left and bottom right corners.
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*/
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void addItem (LayoutItem * item,
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NodeCoordinate topLeft, NodeCoordinate bottomRight);
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/**
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* Adds item with automatic sizing turned on. xr and yr specify
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* which point of the item is bound to node coordinate. Those
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* are relative coordinates so (0, 0) represent top left corner,
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* (0.5, 0.5) represent the center of the item etc.
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*/
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void addItem (LayoutItem * item,
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NodeCoordinate node, qreal xr = 0, qreal yr = 0);
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void removeItem (LayoutItem * item);
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virtual int count() const;
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virtual int indexOf(LayoutItem * item) const;
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virtual LayoutItem * itemAt(int i) const;
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virtual LayoutItem * takeAt(int i);
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protected:
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void relayout();
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private:
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class Private;
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Private * const d;
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};
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}
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#endif /* PLASMA_NODE_LAYOUT */
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