Add optional setDrawsInRightMargin to disable clipping of right edge of TreeViewItems

modules/juce_gui_basics/widgets/juce_TreeView.cpp

@@ -1150,6 +1150,7 @@ TreeViewItem::TreeViewItem()
       drawLinesInside (false),
       drawLinesSet (false),
       drawsInLeftMargin (false),
+      drawsInRightMargin (false),
       openness (opennessDefault)
 {
     static int nextUID = 0;
@@ -1505,6 +1506,11 @@ void TreeViewItem::setDrawsInLeftMargin (bool canDrawInLeftMargin) noexcept
     drawsInLeftMargin = canDrawInLeftMargin;
 }
 
+void TreeViewItem::setDrawsInRightMargin (bool canDrawInRightMargin) noexcept
+{
+    drawsInRightMargin = canDrawInRightMargin;
+}
+
 namespace TreeViewHelpers
 {
     static int calculateDepth (const TreeViewItem* item, const bool rootIsVisible) noexcept
@@ -1532,7 +1538,7 @@ void TreeViewItem::paintRecursively (Graphics& g, int width)
         return;
 
     const int indent = getIndentX();
-    const int itemW = itemWidth < 0 ? width - indent : itemWidth;
+    const int itemW = (itemWidth < 0 || drawsInRightMargin) ? width - indent : itemWidth;
 
     {
         Graphics::ScopedSaveState ss (g);
@@ -1544,7 +1550,7 @@ void TreeViewItem::paintRecursively (Graphics& g, int width)
             if (isSelected())
                 g.fillAll (ownerView->findColour (TreeView::selectedItemBackgroundColourId));
 
-            paintItem (g, itemW, itemHeight);
+            paintItem (g, itemWidth < 0 ? width - indent : itemWidth, itemHeight);
         }
     }
 

modules/juce_gui_basics/widgets/juce_TreeView.h

@@ -446,6 +446,18 @@ public:
     */
     void setDrawsInLeftMargin (bool canDrawInLeftMargin) noexcept;
 
+    /** Sets a flag to indicate that the item wants to be allowed
+        to draw all the way across to the left edge of the treeview.
+
+        Similar to setDrawsInLeftMargin: when this flag is set to true,
+        then the graphics context isn't clipped on the right side. Note,
+        that, in contrast to setDrawsInLeftMargin, you will very rarely need
+        to use this function, as, by default, the paintItem() method
+        won't be clipped on the right hand side, unless your TreeViewItem
+        overrides getItemWidth.
+     */
+    void setDrawsInRightMargin (bool canDrawInRightMargin) noexcept;
+
     //==============================================================================
     /** Saves the current state of open/closed nodes so it can be restored later.
 
@@ -544,6 +556,7 @@ private:
     bool drawLinesInside    : 1;
     bool drawLinesSet       : 1;
     bool drawsInLeftMargin  : 1;
+    bool drawsInRightMargin : 1;
     unsigned int openness   : 2;
 
     friend class TreeView;