diff options
| -rw-r--r-- | chrome/browser/renderer_host/render_widget_host_view_mac.mm | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/chrome/browser/renderer_host/render_widget_host_view_mac.mm b/chrome/browser/renderer_host/render_widget_host_view_mac.mm index 918fdd6..f6844e4 100644 --- a/chrome/browser/renderer_host/render_widget_host_view_mac.mm +++ b/chrome/browser/renderer_host/render_widget_host_view_mac.mm @@ -209,7 +209,16 @@ void RenderWidgetHostViewMac::DidScrollRect( if (is_hidden_) return; - [cocoa_view_ scrollRect:[cocoa_view_ RectToNSRect:rect] + // Before asking the cocoa view to scroll, shorten the rect's height + // by |dx| pixels if we are scrolling left and shorten its height by + // |dy| pixels if we are scrolling up. This will prevent us from + // moving data beyond the bounds of the original rect, which in turn + // prevents us from accidentally drawing over the scrollbars. + gfx::Rect scroll_rect = rect; + scroll_rect.Inset(0, 0, + dx > 0 ? dx : 0, + dy > 0 ? dy : 0); + [cocoa_view_ scrollRect:[cocoa_view_ RectToNSRect:scroll_rect] by:NSMakeSize(dx, -dy)]; gfx::Rect new_rect = rect; |