Custom frame UI for platform apps on Windows.

ui/views/widget/native_widget_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/native_widget_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include <algorithm>
@@ skipping 532 matching lines @@
   if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
     // We need to toggle the rendering policy of the DWM/glass frame as we
     // change from opaque to glass. "Non client rendering enabled" means that
     // the DWM's glass non-client rendering is enabled, which is why
     // DWMNCRP_ENABLED is used for the native frame case. _DISABLED means the
     // DWM doesn't render glass, and so is used in the custom frame case.
     DWMNCRENDERINGPOLICY policy = GetWidget()->ShouldUseNativeFrame() ?
         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
   // changed.
   SendFrameChanged(GetNativeView());
 
   // Update the non-client view with the correct frame view for the active frame
   // type.
   GetWidget()->non_client_view()->UpdateFrame();
 
@@ skipping 722 matching lines @@
 
   // This message initializes the window so that focus border are shown for
   // windows.
   SendMessage(
       hwnd(), WM_CHANGEUISTATE, MAKELPARAM(UIS_CLEAR, UISF_HIDEFOCUS), 0);
 
   // Bug 964884: detach the IME attached to this window.
   // 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.
   ClientAreaSizeChanged();
 
   delegate_->OnNativeWidgetCreated();
 
   // Get access to a modifiable copy of the system menu.
   GetSystemMenu(hwnd(), false);
   return 0;
@@ skipping 329 matching lines @@
     return TRUE;
   }
 
   return DefWindowProcWithRedrawLock(WM_NCACTIVATE,
                                      inactive_rendering_disabled || active, 0);
 }
 
 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;
   }
 
   RECT* client_rect = mode ?
       &(reinterpret_cast<NCCALCSIZE_PARAMS*>(l_param)->rgrc[0]) :
       reinterpret_cast<RECT*>(l_param);
   client_rect->left += insets.left();
   client_rect->top += insets.top();
   client_rect->bottom -= insets.bottom();
@@ skipping 64 matching lines @@
 }
 
 LRESULT NativeWidgetWin::OnNCHitTest(const CPoint& point) {
   if (!GetWidget()->non_client_view()) {
     SetMsgHandled(FALSE);
     return 0;
   }
 
   // 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)) {
       return result;
     }
   }
 
   // First, give the NonClientView a chance to test the point to see if it
   // provides any of the non-client area.
   POINT temp = point;
@@ skipping 554 matching lines @@
       break;
     default:
       NOTREACHED();
   }
 
   set_initial_class_style(class_style);
   set_window_style(window_style() | style);
   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() {
   if (!use_layered_buffer_) {
     RECT r = { 0, 0, 0, 0 };
     if (GetUpdateRect(hwnd(), &r, FALSE) && !IsRectEmpty(&r)) {
       RedrawWindow(hwnd(), &r, NULL,
                    RDW_INVALIDATE | RDW_UPDATENOW | RDW_NOCHILDREN);
     }
   }
@@ skipping 53 matching lines @@
     GetWindowRect(&r);
   gfx::Size s(std::max(0, static_cast<int>(r.right - r.left)),
               std::max(0, static_cast<int>(r.bottom - r.top)));
   if (compositor_.get())
     compositor_->WidgetSizeChanged(s);
   delegate_->OnNativeWidgetSizeChanged(s);
   if (use_layered_buffer_)
     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.
   if (GetWidget()->ShouldUseNativeFrame() || !GetWidget()->non_client_view()) {
     if (force)
       SetWindowRgn(NULL, TRUE);
     return;
   }
 
   // Changing the window region is going to force a paint. Only change the
@@ skipping 219 matching lines @@
   return (GetKeyState(VK_LBUTTON) & 0x80) ||
     (GetKeyState(VK_RBUTTON) & 0x80) ||
     (GetKeyState(VK_MBUTTON) & 0x80) ||
     (GetKeyState(VK_XBUTTON1) & 0x80) ||
     (GetKeyState(VK_XBUTTON2) & 0x80);
 }
 
 }  // namespace internal
 
 }  // namespace views