Bug 1410894 - Add decoration drawing setup to nsWindow, r=jhorak

MozReview-Commit-ID: BHtqoOdfRpS

--HG--
extra : rebase_source : 4baaebff7e86d79de833e14c9284adc22a787180

widget/gtk/nsWindow.cpp

@@ -291,6 +291,8 @@ TimeConverter() {
     return sTimeConverterSingleton;
 }
 
+nsWindow::CSDSupportLevel nsWindow::sCSDSupportLevel = CSD_SUPPORT_UNKNOWN;
+
 namespace mozilla {
 
 class CurrentX11TimeGetter
@@ -480,6 +482,8 @@ nsWindow::nsWindow()
     mLastScrollEventTime = GDK_CURRENT_TIME;
 #endif
     mPendingConfigures = 0;
+    mIsCSDAvailable = false;
+    mIsCSDEnabled = false;
 }
 
 nsWindow::~nsWindow()
@@ -6602,6 +6606,21 @@ nsWindow::ClearCachedResources()
     }
 }
 
+void
+nsWindow::SetDrawsInTitlebar(bool aState)
+{
+  if (!mIsCSDAvailable || aState == mIsCSDEnabled)
+      return;
+
+  if (mShell) {
+      gint wmd = aState ? GDK_DECOR_BORDER : ConvertBorderStyles(mBorderStyle);
+      gdk_window_set_decorations(gtk_widget_get_window(mShell),
+                                 (GdkWMDecoration) wmd);
+  }
+
+  mIsCSDEnabled = aState;
+}
+
 gint
 nsWindow::GdkScaleFactor()
 {
@@ -6872,6 +6891,41 @@ nsWindow::SynthesizeNativeTouchPoint(uint32_t aPointerId,
 }
 #endif
 
+bool
+nsWindow::DoDrawTitlebar() const
+{
+    return mIsCSDEnabled && mSizeState == nsSizeMode_Normal;
+}
+
+nsWindow::CSDSupportLevel
+nsWindow::GetCSDSupportLevel() {
+    if (sCSDSupportLevel != CSD_SUPPORT_UNKNOWN) {
+        return sCSDSupportLevel;
+    }
+    // TODO: MATE
+    const char* currentDesktop = getenv("XDG_CURRENT_DESKTOP");
+    if (currentDesktop) {
+        if (strcmp(currentDesktop, "GNOME") == 0) {
+            sCSDSupportLevel = CSD_SUPPORT_FULL;
+        } else if (strcmp(currentDesktop, "XFCE") == 0) {
+            sCSDSupportLevel = CSD_SUPPORT_FULL;
+        } else if (strcmp(currentDesktop, "X-Cinnamon") == 0) {
+            sCSDSupportLevel = CSD_SUPPORT_FULL;
+        } else if (strcmp(currentDesktop, "KDE") == 0) {
+            sCSDSupportLevel = CSD_SUPPORT_FLAT;
+        } else if (strcmp(currentDesktop, "LXDE") == 0) {
+            sCSDSupportLevel = CSD_SUPPORT_FLAT;
+        } else if (strcmp(currentDesktop, "openbox") == 0) {
+            sCSDSupportLevel = CSD_SUPPORT_FLAT;
+        } else if (strcmp(currentDesktop, "i3") == 0) {
+            sCSDSupportLevel = CSD_SUPPORT_NONE;
+        } else {
+            sCSDSupportLevel = CSD_SUPPORT_NONE;
+        }
+    }
+    return sCSDSupportLevel;
+}
+
 int32_t
 nsWindow::RoundsWidgetCoordinatesTo()
 {

widget/gtk/nsWindow.h

@@ -351,6 +351,8 @@ public:
 #endif
     virtual void GetCompositorWidgetInitData(mozilla::widget::CompositorWidgetInitData* aInitData) override;
 
+    void SetDrawsInTitlebar(bool aState) override;
+
     // HiDPI scale conversion
     gint GdkScaleFactor();
 
@@ -367,6 +369,8 @@ public:
     LayoutDeviceIntRect GdkRectToDevicePixels(GdkRectangle rect);
 
     virtual bool WidgetTypeSupportsAcceleration() override;
+
+    bool DoDrawTitlebar() const;
 protected:
     virtual ~nsWindow();
 
@@ -471,6 +475,10 @@ private:
     // window. See bug 1225044.
     unsigned int mPendingConfigures;
 
+    bool               mIsCSDAvailable;
+    // If true, draw our own window titlebar.
+    bool               mIsCSDEnabled;
+
 #ifdef ACCESSIBILITY
     RefPtr<mozilla::a11y::Accessible> mRootAccessible;
 
@@ -567,6 +575,17 @@ private:
     RefPtr<mozilla::widget::IMContextWrapper> mIMContext;
 
     mozilla::UniquePtr<mozilla::CurrentX11TimeGetter> mCurrentTimeGetter;
+    typedef enum { CSD_SUPPORT_FULL,    // CSD including shadows
+                   CSD_SUPPORT_FLAT,    // CSD without shadows
+                   CSD_SUPPORT_NONE,    // WM does not support CSD at all
+                   CSD_SUPPORT_UNKNOWN
+    } CSDSupportLevel;
+    /**
+     * Get the support of Client Side Decoration by checking
+     * the XDG_CURRENT_DESKTOP environment variable.
+     */
+    static CSDSupportLevel GetCSDSupportLevel();
+    static CSDSupportLevel sCSDSupportLevel;
 };
 
 #endif /* __nsWindow_h__ */