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// Copyright (c) 2006-2008 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 "views/controls/hwnd_view.h"
#include "app/gfx/chrome_canvas.h"
#include "base/logging.h"
#include "views/focus/focus_manager.h"
#include "views/widget/widget.h"
namespace views {
static const char kViewClassName[] = "views/HWNDView";
HWNDView::HWNDView() {
}
HWNDView::~HWNDView() {
}
void HWNDView::Attach(HWND hwnd) {
DCHECK(native_view() == NULL);
DCHECK(hwnd) << "Impossible detatched tab case; See crbug.com/6316";
set_native_view(hwnd);
// First hide the new window. We don't want anything to draw (like sub-hwnd
// borders), when we change the parent below.
ShowWindow(hwnd, SW_HIDE);
// Need to set the HWND's parent before changing its size to avoid flashing.
::SetParent(hwnd, GetWidget()->GetNativeView());
Layout();
// Register with the focus manager so the associated view is focused when the
// native control gets the focus.
FocusManager::InstallFocusSubclass(
hwnd, associated_focus_view() ? associated_focus_view() : this);
}
void HWNDView::Detach() {
DCHECK(native_view());
FocusManager::UninstallFocusSubclass(native_view());
set_native_view(NULL);
set_installed_clip(false);
}
void HWNDView::Paint(ChromeCanvas* canvas) {
// The area behind our window is black, so during a fast resize (where our
// content doesn't draw over the full size of our HWND, and the HWND
// background color doesn't show up), we need to cover that blackness with
// something so that fast resizes don't result in black flash.
//
// It would be nice if this used some approximation of the page's
// current background color.
if (installed_clip())
canvas->FillRectInt(SkColorSetRGB(255, 255, 255), 0, 0, width(), height());
}
std::string HWNDView::GetClassName() const {
return kViewClassName;
}
void HWNDView::ViewHierarchyChanged(bool is_add, View *parent, View *child) {
if (!native_view())
return;
Widget* widget = GetWidget();
if (is_add && widget) {
HWND parent_hwnd = ::GetParent(native_view());
HWND widget_hwnd = widget->GetNativeView();
if (parent_hwnd != widget_hwnd)
::SetParent(native_view(), widget_hwnd);
if (IsVisibleInRootView())
::ShowWindow(native_view(), SW_SHOW);
else
::ShowWindow(native_view(), SW_HIDE);
Layout();
} else if (!is_add) {
::ShowWindow(native_view(), SW_HIDE);
::SetParent(native_view(), NULL);
}
}
void HWNDView::Focus() {
::SetFocus(native_view());
}
void HWNDView::InstallClip(int x, int y, int w, int h) {
HRGN clip_region = CreateRectRgn(x, y, x + w, y + h);
// NOTE: SetWindowRgn owns the region (as well as the deleting the
// current region), as such we don't delete the old region.
SetWindowRgn(native_view(), clip_region, FALSE);
}
void HWNDView::UninstallClip() {
SetWindowRgn(native_view(), 0, FALSE);
}
void HWNDView::ShowWidget(int x, int y, int w, int h) {
UINT swp_flags = SWP_DEFERERASE |
SWP_NOACTIVATE |
SWP_NOCOPYBITS |
SWP_NOOWNERZORDER |
SWP_NOZORDER;
// Only send the SHOWWINDOW flag if we're invisible, to avoid flashing.
if (!::IsWindowVisible(native_view()))
swp_flags = (swp_flags | SWP_SHOWWINDOW) & ~SWP_NOREDRAW;
if (fast_resize()) {
// In a fast resize, we move the window and clip it with SetWindowRgn.
CRect rect;
GetWindowRect(native_view(), &rect);
::SetWindowPos(native_view(), 0, x, y, rect.Width(), rect.Height(),
swp_flags);
HRGN clip_region = CreateRectRgn(0, 0, w, h);
SetWindowRgn(native_view(), clip_region, FALSE);
set_installed_clip(true);
} else {
::SetWindowPos(native_view(), 0, x, y, w, h, swp_flags);
}
}
void HWNDView::HideWidget() {
if (!::IsWindowVisible(native_view()))
return; // Currently not visible, nothing to do.
// The window is currently visible, but its clipped by another view. Hide
// it.
::SetWindowPos(native_view(), 0, 0, 0, 0, 0,
SWP_HIDEWINDOW | SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER |
SWP_NOREDRAW | SWP_NOOWNERZORDER);
}
} // namespace views
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