!23 优化availablegeometry功能

Merge pull request !23 from Augenblick/openkylin/nile

src/plugins/platforms/xcb/qxcbscreen.cpp

@@ -37,6 +37,15 @@
 **
 ****************************************************************************/
 
+/*
+ * This file is only intended for use with the Kylin system and requires reliance on Kylin's UKUI-Panel to update availableGeometry. The main contents include:
+ * 1.Added the QXcbVirtualDesktop::getPanelWindow method for obtaining the taskbar window.
+ * 2.Added the QXcbScreen::kyinAvailableGeometry interface for performing actual updates to the m_availableGeometry of the main and extended screens after receiving the necessary update signal.
+ * 3.Fixed an issue with incorrect retrieval of the working area in certain cases in getWorkArea.
+ * 4.Fixed an issue with incorrect calculation of the availableGeometry in certain cases.
+ * 5.Modified the availableGeometry function to directly return the correct m_availableGeometry.
+ */
+
 #include "qxcbscreen.h"
 #include "qxcbwindow.h"
 #include "qxcbcursor.h"
@@ -281,6 +290,40 @@ void QXcbVirtualDesktop::handleScreenChange(xcb_randr_screen_change_notify_event
     to get height of the panel, but I did not find one. Maybe other WMs have their own tricks, so
     the reliability of this approach is questionable.
  */
+
+xcb_window_t QXcbVirtualDesktop::getPanelWindow(xcb_window_t top, const char *name) const
+{
+    xcb_window_t *children;
+    unsigned int nchildren;
+    unsigned int i;
+    auto tree = Q_XCB_REPLY(xcb_query_tree, xcb_connection(), top);
+    if (!tree)
+        return 0;
+    nchildren = xcb_query_tree_children_length (tree.get());
+    children = xcb_query_tree_children (tree.get());
+    size_t len = strlen(name);
+
+    for (i = 0; i < nchildren; i++) {
+        auto property = Q_XCB_REPLY(xcb_get_property, xcb_connection(), false, children[i],
+                               atom(QXcbAtom::_NET_WM_NAME),
+                               atom(QXcbAtom::UTF8_STRING), 0, 1024);
+        if (property && (property->type == atom(QXcbAtom::UTF8_STRING))) {
+            const char *win_name = (const char*)xcb_get_property_value (property.get());
+            int win_name_len = xcb_get_property_value_length (property.get());
+            if (memcmp(win_name, name, win_name_len) == 0 && len == (size_t)win_name_len) {
+                return children[i];
+            }
+        }
+    }
+
+    for (i = 0; i < nchildren; i++) {
+        auto win = getPanelWindow(children[i], name);
+        if (win)
+            return win;
+    }
+    return 0;
+}
+
 QRect QXcbVirtualDesktop::getWorkArea() const
 {
     QRect r;
@@ -550,7 +593,7 @@ QXcbScreen::QXcbScreen(QXcbConnection *connection, QXcbVirtualDesktop *virtualDe
     } else if (xineramaScreenInfo) {
         m_geometry = QRect(xineramaScreenInfo->x_org, xineramaScreenInfo->y_org,
                            xineramaScreenInfo->width, xineramaScreenInfo->height);
-        m_availableGeometry = m_virtualDesktop->availableGeometry(m_geometry);
+        m_availableGeometry = kylinAvailableGeometry();
         m_sizeMillimeters = sizeInMillimeters(m_geometry.size(), m_virtualDesktop->dpi());
         if (xineramaScreenIdx > -1)
             m_outputName += QLatin1Char('-') + QString::number(xineramaScreenIdx);
@@ -560,7 +603,7 @@ QXcbScreen::QXcbScreen(QXcbConnection *connection, QXcbVirtualDesktop *virtualDe
         m_geometry = QRect(QPoint(), virtualDesktop->size());
 
     if (m_availableGeometry.isEmpty())
-        m_availableGeometry = m_virtualDesktop->availableGeometry(m_geometry);
+        m_availableGeometry = kylinAvailableGeometry();
 
     if (m_sizeMillimeters.isEmpty())
         m_sizeMillimeters = virtualDesktop->physicalSize();
@@ -825,10 +868,13 @@ void QXcbScreen::sendStartupMessage(const QByteArray &message) const
 
 QRect QXcbScreen::availableGeometry() const
 {
+    /*
     static bool enforceNetWorkarea = !qEnvironmentVariableIsEmpty("QT_RELY_ON_NET_WORKAREA_ATOM");
     bool isMultiHeadSystem = virtualSiblings().length() > 1;
     bool useScreenGeometry = isMultiHeadSystem && !enforceNetWorkarea;
     return useScreenGeometry ? m_geometry : m_availableGeometry;
+    */
+   return m_availableGeometry;
 }
 
 QImage::Format QXcbScreen::format() const
@@ -939,15 +985,38 @@ void QXcbScreen::updateGeometry(const QRect &geometry, uint8_t rotation)
         m_sizeMillimeters = sizeInMillimeters(geometry.size(), m_virtualDesktop->dpi());
 
     m_geometry = geometry;
-    m_availableGeometry = m_virtualDesktop->availableGeometry(m_geometry);
+    m_availableGeometry = kylinAvailableGeometry();
     QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), m_geometry, m_availableGeometry);
     if (m_orientation != oldOrientation)
         QWindowSystemInterface::handleScreenOrientationChange(QPlatformScreen::screen(), m_orientation);
 }
 
+QRect QXcbScreen::kylinAvailableGeometry()
+{
+    QRect availableGeometry = m_geometry;
+    const char *name = "UKUI Panel";
+    xcb_window_t win = m_virtualDesktop->getPanelWindow(screen()->root, name);
+
+    if (win) {
+        auto geometry = Q_XCB_REPLY(xcb_get_geometry, xcb_connection(), win);
+        auto trans = Q_XCB_REPLY(xcb_translate_coordinates, xcb_connection(), win, geometry->root,
+                                    -(geometry->border_width), -(geometry->border_width));
+        QRegion screenRgn(m_geometry);
+        QRegion panelRgn(trans->dst_x, trans->dst_y, (geometry->width + 2) / 10 * 10, geometry->height);
+
+        if (screenRgn.contains(panelRgn.boundingRect().center())) {
+            QRegion workArea = screenRgn - panelRgn;
+            QRegion::const_iterator begin = workArea.cbegin();
+            availableGeometry = static_cast<QRect>(*begin);
+        }
+    }
+
+    return availableGeometry;
+}
+
 void QXcbScreen::updateAvailableGeometry()
 {
-    QRect availableGeometry = m_virtualDesktop->availableGeometry(m_geometry);
+    QRect availableGeometry = kylinAvailableGeometry();
     if (m_availableGeometry != availableGeometry) {
         m_availableGeometry = availableGeometry;
         QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), m_geometry, m_availableGeometry);

src/plugins/platforms/xcb/qxcbscreen.h

@@ -113,6 +113,7 @@ public:
     quint8 depthOfVisual(xcb_visualid_t) const;
     xcb_colormap_t colormapForVisual(xcb_visualid_t) const;
 
+    xcb_window_t getPanelWindow(xcb_window_t top, const char *name) const;
 private:
     QRect getWorkArea() const;
 
@@ -214,6 +215,7 @@ public:
     void updateGeometry(const QRect &geometry, uint8_t rotation);
     void updateGeometry(xcb_timestamp_t timestamp = XCB_TIME_CURRENT_TIME);
     void updateAvailableGeometry();
+    QRect kylinAvailableGeometry();
     void updateRefreshRate(xcb_randr_mode_t mode);
 
     QFontEngine::HintStyle hintStyle() const { return m_virtualDesktop->hintStyle(); }