add ElectricBorderCornerRatio setting [0,1]

REVIEW: 106509
CCBUG: 308993

events.cpp

@@ -1344,9 +1344,9 @@ void Client::checkQuickTilingMaximizationZones(int xroot, int yroot)
         }
 
         if (mode != QuickTileNone) {
-            if (yroot <= area.y() + area.height() / 4)
+            if (yroot <= area.y() + area.height() * options->electricBorderCornerRatio())
                 mode |= QuickTileTop;
-            else if (yroot >= area.y() + area.height() - area.height() / 4)
+            else if (yroot >= area.y() + area.height() - area.height()  * options->electricBorderCornerRatio())
                 mode |= QuickTileBottom;
         } else if (options->electricBorderMaximize() && yroot <= area.y() + 5 && isMaximizable())
             mode = QuickTileMaximize;

options.cpp

@@ -187,6 +187,7 @@ Options::Options(QObject *parent)
     , electric_border_pushback_pixels(Options::defaultElectricBorderPushbackPixels())
     , electric_border_maximize(Options::defaultElectricBorderMaximize())
     , electric_border_tiling(Options::defaultElectricBorderTiling())
+    , electric_border_corner_ratio(Options::defaultElectricBorderCornerRatio())
     , borderless_maximized_windows(Options::defaultBorderlessMaximizedWindows())
     , show_geometry_tip(Options::defaultShowGeometryTip())
     , animationSpeed(Options::defaultAnimationSpeed())
@@ -582,6 +583,15 @@ void Options::setElectricBorderTiling(bool electricBorderTiling)
     emit electricBorderTilingChanged();
 }
 
+void Options::setElectricBorderCornerRatio(float electricBorderCornerRatio)
+{
+    if (electric_border_corner_ratio == electricBorderCornerRatio) {
+        return;
+    }
+    electric_border_corner_ratio = electricBorderCornerRatio;
+    emit electricBorderCornerRatioChanged();
+}
+
 void Options::setBorderlessMaximizedWindows(bool borderlessMaximizedWindows)
 {
     if (borderless_maximized_windows == borderlessMaximizedWindows) {
@@ -876,6 +886,8 @@ unsigned long Options::loadConfig()
     setElectricBorderPushbackPixels(config.readEntry("ElectricBorderPushbackPixels", Options::defaultElectricBorderPushbackPixels()));
     setElectricBorderMaximize(config.readEntry("ElectricBorderMaximize", Options::defaultElectricBorderMaximize()));
     setElectricBorderTiling(config.readEntry("ElectricBorderTiling", Options::defaultElectricBorderTiling()));
+    const float ebr = config.readEntry("ElectricBorderCornerRatio", Options::defaultElectricBorderCornerRatio());
+    setElectricBorderCornerRatio(qMin(qMax(ebr, 0.0f), 1.0f));
 
     OpTitlebarDblClick = windowOperation(config.readEntry("TitlebarDoubleClickCommand", "Maximize"), true);
     setOpMaxButtonLeftClick(windowOperation(config.readEntry("MaximizeButtonLeftClickCommand", "Maximize"), true));

options.h

@@ -155,6 +155,10 @@ class Options : public QObject, public KDecorationOptions
     * Whether a window is tiled to half screen when reaching left or right screen edge while been moved
     */
     Q_PROPERTY(bool electricBorderTiling READ electricBorderTiling WRITE setElectricBorderTiling NOTIFY electricBorderTilingChanged)
+    /**
+    * Whether a window is tiled to half screen when reaching left or right screen edge while been moved
+    */
+    Q_PROPERTY(float electricBorderCornerRatio READ electricBorderCornerRatio WRITE setElectricBorderCornerRatio NOTIFY electricBorderCornerRatioChanged)
     Q_PROPERTY(bool borderlessMaximizedWindows READ borderlessMaximizedWindows WRITE setBorderlessMaximizedWindows NOTIFY borderlessMaximizedWindowsChanged)
     /**
      * timeout before non-responding application will be killed after attempt to close
@@ -480,6 +484,12 @@ public:
     bool electricBorderTiling() const {
         return electric_border_tiling;
     }
+    /**
+    * @returns the factor that determines the corner part of the edge (ie. 0.1 means tiny corner)
+    */
+    float electricBorderCornerRatio() const {
+        return electric_border_corner_ratio;
+    }
 
     bool borderlessMaximizedWindows() const {
         return borderless_maximized_windows;
@@ -611,6 +621,7 @@ public:
     void setElectricBorderPushbackPixels(int electricBorderPushbackPixels);
     void setElectricBorderMaximize(bool electricBorderMaximize);
     void setElectricBorderTiling(bool electricBorderTiling);
+    void setElectricBorderCornerRatio(float electricBorderCornerRatio);
     void setBorderlessMaximizedWindows(bool borderlessMaximizedWindows);
     void setKillPingTimeout(int killPingTimeout);
     void setHideUtilityWindowsForInactive(bool hideUtilityWindowsForInactive);
@@ -788,6 +799,9 @@ public:
     static bool defaultElectricBorderTiling() {
         return true;
     }
+    static float defaultElectricBorderCornerRatio() {
+        return 0.25;
+    }
     static bool defaultBorderlessMaximizedWindows() {
         return false;
     }
@@ -914,6 +928,7 @@ Q_SIGNALS:
     void electricBorderPushbackPixelsChanged();
     void electricBorderMaximizeChanged();
     void electricBorderTilingChanged();
+    void electricBorderCornerRatioChanged();
     void borderlessMaximizedWindowsChanged();
     void killPingTimeoutChanged();
     void hideUtilityWindowsForInactiveChanged();
@@ -1014,6 +1029,7 @@ private:
     int electric_border_pushback_pixels;
     bool electric_border_maximize;
     bool electric_border_tiling;
+    float electric_border_corner_ratio;
     bool borderless_maximized_windows;
     bool show_geometry_tip;
     int animationSpeed; // 0 - instant, 5 - very slow