support for multiple windows thumbnails in a tooltip

svn path=/trunk/KDE/kdelibs/; revision=941541

private/tooltip.cpp

@@ -226,7 +226,14 @@ void ToolTip::setContent(QObject *tipper, const ToolTipContent &data)
     //reset our size
     d->text->setContent(data);
     d->imageLabel->setPixmap(data.image());
-    d->preview->setWindowId(data.windowToPreview());
+    if (data.windowsToPreview().size() > 1) {
+        d->preview->setWindowIds(data.windowsToPreview());
+    } else {
+        QList<WId>ids;
+        ids.append(data.windowToPreview());
+        d->preview->setWindowIds(ids);
+    }
+
     d->autohide = data.autohide();
     d->source = tipper;
 
@@ -239,7 +246,7 @@ void ToolTip::setContent(QObject *tipper, const ToolTipContent &data)
 
 void ToolTip::prepareShowing()
 {
-    if (d->preview->windowId() != 0) {
+    if (!d->preview->isEmpty()) {
         // show/hide the preview area
         d->preview->show();
     } else {

private/windowpreview.cpp

@@ -65,53 +65,86 @@ WindowPreview::WindowPreview(QWidget *parent)
     m_background->setElementPrefix("raised");
 }
 
-void WindowPreview::setWindowId(WId w)
+void WindowPreview::setWindowIds(const QList<WId> wids)
 {
     if (!previewsAvailable()) {
         setMinimumSize(0,0);
         setMaximumSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
-        id = 0;
+        ids.clear();
         return;
     }
-    id = w;
-    readWindowSize();
+    ids = wids;
+    readWindowSizes();
     QSize s(sizeHint());
     if (s.isValid()) {
         setFixedSize(sizeHint());
     }
 }
 
-WId WindowPreview::windowId() const
+QList<WId> WindowPreview::windowIds() const
 {
-    return id;
+    return ids;
 }
 
 QSize WindowPreview::sizeHint() const
 {
-    if (id == 0) {
+    if (ids.size() == 0) {
         return QSize();
     }
-    if (!windowSize.isValid()) {
-        readWindowSize();
+    if (!windowSizes.size() == 0) {
+        readWindowSizes();
     }
-    QSize s = windowSize;
-    s.scale(200, 150, Qt::KeepAspectRatio);
+
+    int maxHeight = 0;
+    int totalWidth = 0;
+    foreach (QSize s, windowSizes) {
+        if (s.height() > maxHeight) {
+            maxHeight = s.height();
+        }
+
+        totalWidth += s.width();
+    }
+
+    QSize s(totalWidth, maxHeight);
+
+    qreal left, top, right, bottom;
+    m_background->getMargins(left, top, right, bottom);
+
+    s.scale(windowWidth*windowSizes.size(), windowHeight, Qt::KeepAspectRatio);
+
+    s = s + QSize(left+right+windowMargin*(windowSizes.size()-1), top+bottom);
 
     return s;
 }
 
-void WindowPreview::readWindowSize() const
+void WindowPreview::readWindowSizes() const
 {
+    windowSizes.clear();
+    foreach (WId id, ids) {
 #ifdef Q_WS_X11
         if (id > 0) {
             KWindowInfo info = KWindowSystem::windowInfo(id, NET::WMGeometry|NET::WMFrameExtents);
-        windowSize = info.frameGeometry().size();
+            windowSizes.append(info.frameGeometry().size());
         } else {
-        windowSize = QSize();
+            windowSizes.append(QSize());
         }
 #else
-    windowSize = QSize();
+        windowSizes.append(QSize());
 #endif
+    }
+}
+
+bool WindowPreview::isEmpty() const
+{
+  if (ids.size() == 0) {
+      return true;
+  }
+  foreach (WId id, ids) {
+      if (id != 0) {
+          return false;
+      }
+  }
+  return true;
 }
 
 void WindowPreview::setInfo()
@@ -119,14 +152,14 @@ void WindowPreview::setInfo()
 #ifdef Q_WS_X11
     Display *dpy = QX11Info::display();
     Atom atom = XInternAtom(dpy, "_KDE_WINDOW_PREVIEW", False);
-    if (id == 0) {
+    if (isEmpty()) {
         XDeleteProperty(dpy, parentWidget()->winId(), atom);
         return;
     }
-    if (!windowSize.isValid()) {
-        readWindowSize();
+    if (windowSizes.size() == 0) {
+        readWindowSizes();
     }
-    if (!windowSize.isValid()) {
+    if (windowSizes.size() == 0) {
         XDeleteProperty(dpy, parentWidget()->winId(), atom);
         return;
     }
@@ -140,8 +173,33 @@ void WindowPreview::setInfo()
     m_background->getMargins(left, top, right, bottom);
     QRect thumbnailRect = geometry().adjusted(left, top, -right, -bottom);
 
+    const int numWindows = ids.size();
+
+    QList <QRect> thumbnailRects;
+    int x = thumbnailRect.x();
+
+    foreach (QSize s, windowSizes) {
+        s.scale((qreal)(thumbnailRect.width()-5*(numWindows-1))/numWindows, thumbnailRect.height(), Qt::KeepAspectRatio);
+        int y = thumbnailRect.y() + (thumbnailRect.height() - s.height())/2;
+        thumbnailRects.append(QRect(QPoint(x,y), s));
+        x += s.width() + 5;
+    }
+
+    long data[(1 + 6*numWindows)];
+    data[0] = numWindows;
+
+    for (int i = 0; i<numWindows; ++i) {
+        const int start = i*6+1;
+        const QRect thumbnailRect = thumbnailRects[i];
+
+        data[start] = 5;
+        data[start+1] = ids[i];
+        data[start+2] = thumbnailRect.x();
+        data[start+3] = thumbnailRect.y();
+        data[start+4] = thumbnailRect.width();
+        data[start+5] = thumbnailRect.height();
+    }
 
-    long data[] = { 1, 5, id, thumbnailRect.x(), thumbnailRect.y(), thumbnailRect.width(), thumbnailRect.height() };
     XChangeProperty(dpy, parentWidget()->winId(), atom, atom, 32, PropModeReplace,
         reinterpret_cast<unsigned char *>(data), sizeof(data) / sizeof(data[ 0 ]));
 #endif

private/windowpreview_p.h

@@ -44,20 +44,25 @@ public:
 
     WindowPreview(QWidget *parent = 0);
 
-    void setWindowId(WId w);
-    WId windowId() const;
+    void setWindowIds(const QList<WId> w);
+    QList<WId> windowIds() const;
     void setInfo();
+    bool isEmpty() const;
     virtual QSize sizeHint() const;
 
 protected:
     void paintEvent(QPaintEvent *e);
 
 private:
-    void readWindowSize() const;
+    void readWindowSizes() const;
 
-    WId id;
-    mutable QSize windowSize;
+    QList<WId> ids;
+    mutable QList<QSize> windowSizes;
     FrameSvg *m_background;
+
+    static const int windowMargin = 5;
+    static const int windowWidth = 200;
+    static const int windowHeight = 150;
 };
 
 } // namespace Plasma

tooltipcontent.cpp

@@ -46,15 +46,14 @@ class ToolTipContentPrivate
 {
 public:
     ToolTipContentPrivate()
-      : windowToPreview(0),
-        autohide(true)
+      : autohide(true)
     {
     }
 
     QString mainText;
     QString subText;
     QPixmap image;
-    WId windowToPreview;
+    QList<WId> windowsToPreview;
     QHash<QString, ToolTipResource> resources;
     bool autohide;
 };
@@ -105,7 +104,7 @@ bool ToolTipContent::isEmpty() const
     return d->mainText.isEmpty() &&
            d->subText.isEmpty() &&
            d->image.isNull() &&
-           d->windowToPreview == 0;
+           (d->windowsToPreview.size() == 0);
 }
 
 void ToolTipContent::setMainText(const QString &text)
@@ -143,14 +142,29 @@ QPixmap ToolTipContent::image() const
     return d->image;
 }
 
-void ToolTipContent::setWindowToPreview(WId id)
+void ToolTipContent::setWindowToPreview(const WId id)
 {
-    d->windowToPreview = id;
+    d->windowsToPreview.clear();
+    d->windowsToPreview.append(id);
 }
 
 WId ToolTipContent::windowToPreview() const
 {
-    return d->windowToPreview;
+    if (d->windowsToPreview.size() == 1) {
+        return d->windowsToPreview.first();
+    } else {
+        return 0;
+    }
+}
+
+void ToolTipContent::setWindowsToPreview(QList<WId> ids)
+{
+    d->windowsToPreview = ids;
+}
+
+QList<WId> ToolTipContent::windowsToPreview() const
+{
+    return d->windowsToPreview;
 }
 
 void ToolTipContent::setAutohide(bool autohide)

tooltipcontent.h

@@ -23,6 +23,7 @@
 #include <QtCore/QString>
 #include <QtCore/QUrl>
 #include <QtCore/QVariant>
+#include <QtCore/QList>
 #include <QtGui/QPixmap>
 #include <QtGui/QIcon>
 
@@ -91,12 +92,20 @@ public:
     /** An icon to display */
     QPixmap image() const;
 
+    //BIC FIXME: remove when we can break BC
     /** Sets the ID of the window to show a preview for */
     void setWindowToPreview(WId id);
 
+    //BIC FIXME: remove when we can break BC
     /** Id of a window if you want to show a preview */
     WId windowToPreview() const;
 
+    /** Sets the IDS of the windows to show a preview for */
+    void setWindowsToPreview(const QList<WId> ids);
+
+    /** Ids of a windows if you want to show a preview */
+    QList<WId> windowsToPreview() const;
+
     /** Sets whether or not to autohide the tooltip, defaults to true */
     void setAutohide(bool autohide);