Allow event coordinate margins in SubWidget

Signed-off-by: falkTX <falktx@falktx.com>

dgl/SubWidget.hpp

@@ -111,6 +111,22 @@ public:
     */
     void setAbsolutePos(const Point<int>& pos) noexcept;
 
+   /**
+      Get the margin currently in use for widget coordinates.
+      By default this value is (0,0).
+    */
+    Point<int> getMargin() const noexcept;
+
+   /**
+      Set a margin to be used for widget coordinates using @a x and @a y values.
+    */
+    void setMargin(int x, int y) noexcept;
+
+   /**
+      Set a margin to be used for widget coordinates.
+    */
+    void setMargin(const Point<int>& offset) noexcept;
+
    /**
       Get parent Widget, as passed in the constructor.
     */

dgl/src/SubWidget.cpp

@@ -32,9 +32,9 @@ SubWidget::~SubWidget()
 }
 
 template<typename T>
-bool SubWidget::contains(T x, T y) const noexcept
+bool SubWidget::contains(const T x, const T y) const noexcept
 {
-    return Rectangle<double>(0, 0, getWidth(), getHeight()).contains(x, y);
+    return Rectangle<double>(0, 0, getWidth()-pData->margin.getX(), getHeight()-pData->margin.getY()).contains(x, y);
 }
 
 template<typename T>
@@ -70,17 +70,17 @@ Rectangle<uint> SubWidget::getConstrainedAbsoluteArea() const noexcept
                            getSize());
 }
 
-void SubWidget::setAbsoluteX(int x) noexcept
+void SubWidget::setAbsoluteX(const int x) noexcept
 {
     setAbsolutePos(Point<int>(x, getAbsoluteY()));
 }
 
-void SubWidget::setAbsoluteY(int y) noexcept
+void SubWidget::setAbsoluteY(const int y) noexcept
 {
     setAbsolutePos(Point<int>(getAbsoluteX(), y));
 }
 
-void SubWidget::setAbsolutePos(int x, int y) noexcept
+void SubWidget::setAbsolutePos(const int x, const int y) noexcept
 {
     setAbsolutePos(Point<int>(x, y));
 }
@@ -100,6 +100,21 @@ void SubWidget::setAbsolutePos(const Point<int>& pos) noexcept
     repaint();
 }
 
+Point<int> SubWidget::getMargin() const noexcept
+{
+    return pData->margin;
+}
+
+void SubWidget::setMargin(const int x, const int y) noexcept
+{
+    pData->margin = Point<int>(x, y);
+}
+
+void SubWidget::setMargin(const Point<int>& offset) noexcept
+{
+    pData->margin = offset;
+}
+
 Widget* SubWidget::getParentWidget() const noexcept
 {
     return pData->parentWidget;

dgl/src/SubWidgetPrivateData.cpp

@@ -26,6 +26,7 @@ SubWidget::PrivateData::PrivateData(SubWidget* const s, Widget* const pw)
       selfw((Widget*)s),
       parentWidget(pw),
       absolutePos(),
+      margin(),
       needsFullViewportForDrawing(false),
       needsViewportScaling(false),
       skipDrawing(false),

dgl/src/SubWidgetPrivateData.hpp

@@ -28,6 +28,7 @@ struct SubWidget::PrivateData {
     Widget* const selfw;
     Widget* const parentWidget;
     Point<int> absolutePos;
+    Point<int> margin;
     bool needsFullViewportForDrawing; // needed for widgets drawing out of bounds
     bool needsViewportScaling; // needed for NanoVG
     bool skipDrawing; // for context reuse in NanoVG based guis

dgl/src/WidgetPrivateData.cpp

@@ -152,8 +152,8 @@ bool Widget::PrivateData::giveMouseEventForSubWidgets(MouseEvent& ev)
         if (! widget->isVisible())
             continue;
 
-        ev.pos = Point<double>(x - widget->getAbsoluteX(),
-                               y - widget->getAbsoluteY());
+        ev.pos = Point<double>(x - widget->getAbsoluteX() + widget->getMargin().getX(),
+                               y - widget->getAbsoluteY() + widget->getMargin().getY());
 
         if (widget->onMouse(ev))
             return true;
@@ -191,8 +191,8 @@ bool Widget::PrivateData::giveMotionEventForSubWidgets(MotionEvent& ev)
         if (! widget->isVisible())
             continue;
 
-        ev.pos = Point<double>(x - widget->getAbsoluteX(),
-                               y - widget->getAbsoluteY());
+        ev.pos = Point<double>(x - widget->getAbsoluteX() + widget->getMargin().getX(),
+                               y - widget->getAbsoluteY() + widget->getMargin().getY());
 
         if (widget->onMotion(ev))
             return true;
@@ -230,8 +230,8 @@ bool Widget::PrivateData::giveScrollEventForSubWidgets(ScrollEvent& ev)
         if (! widget->isVisible())
             continue;
 
-        ev.pos = Point<double>(x - widget->getAbsoluteX(),
-                               y - widget->getAbsoluteY());
+        ev.pos = Point<double>(x - widget->getAbsoluteX() + widget->getMargin().getX(),
+                               y - widget->getAbsoluteY() + widget->getMargin().getY());
 
         if (widget->onScroll(ev))
             return true;