Custom frame UI for platform apps on Windows.

ui/views/widget/native_widget_win.cc

Index: ui/views/widget/native_widget_win.cc
diff --git a/ui/views/widget/native_widget_win.cc b/ui/views/widget/native_widget_win.cc
index 8ce9e9249df0bc5742541146c286dd8fe7ef3c79..41c00195b49d415a24b4e9c1d39a16f05bee638d 100644
--- a/ui/views/widget/native_widget_win.cc
+++ b/ui/views/widget/native_widget_win.cc
@@ -550,6 +550,10 @@ void NativeWidgetWin::FrameTypeChanged() {
         DWMNCRP_ENABLED : DWMNCRP_DISABLED;
     DwmSetWindowAttribute(GetNativeView(), DWMWA_NCRENDERING_POLICY,
                           &policy, sizeof(DWMNCRENDERINGPOLICY));
+
+    if (remove_standard_frame_) {
+      UpdateDWMFrame();

[Ben Goodger (Google), 2012/02/07 20:18:57]

no braces on single line if

[jeremya, 2012/02/08 00:35:16]

Done.

+    }
   }
 
   // Send a frame change notification, since the non-client metrics have
@@ -1292,6 +1296,11 @@ LRESULT NativeWidgetWin::OnCreate(CREATESTRUCT* create_struct) {
   // We should attach IMEs only when we need to input CJK strings.
   ImmAssociateContextEx(hwnd(), NULL, 0);
 
+  if (remove_standard_frame_) {
+    SendFrameChanged(GetNativeView());
+    UpdateDWMFrame();
+  }
+
   // We need to allow the delegate to size its contents since the window may not
   // receive a size notification when its initial bounds are specified at window
   // creation time.
@@ -1641,9 +1650,11 @@ LRESULT NativeWidgetWin::OnNCActivate(BOOL active) {
 LRESULT NativeWidgetWin::OnNCCalcSize(BOOL mode, LPARAM l_param) {
   // We only override the default handling if we need to specify a custom
   // non-client edge width. Note that in most cases "no insets" means no
-  // custom width, but in fullscreen mode we want a custom width of 0.
+  // custom width, but in fullscreen mode or when the NonClientFrameView
+  // requests it, we want a custom width of 0.
   gfx::Insets insets = GetClientAreaInsets();
-  if (insets.empty() && !IsFullscreen()) {
+  if (insets.empty() && !IsFullscreen() &&
+      !(mode && remove_standard_frame_)) {
     SetMsgHandled(FALSE);
     return 0;
   }
@@ -1728,7 +1739,7 @@ LRESULT NativeWidgetWin::OnNCHitTest(const CPoint& point) {
 
   // If the DWM is rendering the window controls, we need to give the DWM's
   // default window procedure first chance to handle hit testing.
-  if (GetWidget()->ShouldUseNativeFrame()) {
+  if (!remove_standard_frame_ && GetWidget()->ShouldUseNativeFrame()) {
     LRESULT result;
     if (DwmDefWindowProc(GetNativeView(), WM_NCHITTEST, 0,
                          MAKELPARAM(point.x, point.y), &result)) {
@@ -2303,6 +2314,7 @@ void NativeWidgetWin::SetInitParams(const Widget::InitParams& params) {
   set_window_ex_style(window_ex_style() | ex_style);
 
   has_non_client_view_ = Widget::RequiresNonClientView(params.type);
+  remove_standard_frame_ = params.remove_standard_frame;
 }
 
 void NativeWidgetWin::RedrawInvalidRect() {
@@ -2376,6 +2388,11 @@ void NativeWidgetWin::ClientAreaSizeChanged() {
     layered_window_contents_.reset(new gfx::CanvasSkia(s, false));
 }
 
+void NativeWidgetWin::UpdateDWMFrame() {
+  MARGINS m = {10, 10, 10, 10};
+  DwmExtendFrameIntoClientArea(GetNativeView(), &m);

[Ben Goodger (Google), 2012/02/07 20:18:57]

I understand the NCCALCSIZE handling... but what is this required for?

[jeremya, 2012/02/08 00:35:16]

Without this, Windows doesn't draw any glass, which means we don't get a drop
shadow.

+}
+
 void NativeWidgetWin::ResetWindowRegion(bool force) {
   // A native frame uses the native window region, and we don't want to mess
   // with it.