Add 'resize_leading_on_bounds_change' property into the SingleSplitView.

When it is turned on, leading component is resized when split view gets new bounds.

Review URL: http://codereview.chromium.org/155214

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20258 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 28 insertions, 1 deletions

diff --git a/views/controls/single_split_view.cc b/views/controls/single_split_view.cc
index dadf4b2..7915171 100644
--- a/views/controls/single_split_view.cc
+++ b/views/controls/single_split_view.cc
@@ -21,7 +21,8 @@ SingleSplitView::SingleSplitView(View* leading,
                                  View* trailing,
                                  Orientation orientation)
     : is_horizontal_(orientation == HORIZONTAL_SPLIT),
-      divider_offset_(-1) {
+      divider_offset_(-1),
+      resize_leading_on_bounds_change_(true) {
   AddChildView(leading);
   AddChildView(trailing);
 #if defined(OS_WIN)
@@ -31,6 +32,20 @@ SingleSplitView::SingleSplitView(View* leading,
 #endif
 }
 
+void SingleSplitView::DidChangeBounds(const gfx::Rect& previous,
+                                      const gfx::Rect& current) {
+  if (resize_leading_on_bounds_change_) {
+    if (is_horizontal_)
+      divider_offset_ += current.width() - previous.width();
+    else
+      divider_offset_ += current.height() - previous.height();
+
+    if (divider_offset_ < 0)
+      divider_offset_ = kDividerSize;
+  }
+  View::DidChangeBounds(previous, current);
+}
+
 void SingleSplitView::Layout() {
   if (GetChildViewCount() != 2)
     return;
diff --git a/views/controls/single_split_view.h b/views/controls/single_split_view.h
index 74377df..af982e4 100644
--- a/views/controls/single_split_view.h
+++ b/views/controls/single_split_view.h
@@ -20,6 +20,9 @@ class SingleSplitView : public views::View {
 
   SingleSplitView(View* leading, View* trailing, Orientation orientation);
 
+  virtual void DidChangeBounds(const gfx::Rect& previous,
+                               const gfx::Rect& current);
+
   virtual void Layout();
 
   // SingleSplitView's preferred size is the sum of the preferred widths
@@ -36,6 +39,13 @@ class SingleSplitView : public views::View {
   }
   int divider_offset() { return divider_offset_; }
 
+  // Sets whether the leading component is resized when the split views size
+  // changes. The default is true. A value of false results in the trailing
+  // component resizing on a bounds change.
+  void set_resize_leading_on_bounds_change(bool resize) {
+    resize_leading_on_bounds_change_ = resize;
+  }
+
  protected:
   virtual bool OnMousePressed(const MouseEvent& event);
   virtual bool OnMouseDragged(const MouseEvent& event);
@@ -70,6 +80,8 @@ class SingleSplitView : public views::View {
   // Position of the divider.
   int divider_offset_;
 
+  bool resize_leading_on_bounds_change_;
+
   DISALLOW_COPY_AND_ASSIGN(SingleSplitView);
 };