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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 "chrome/views/hwnd_view.h"
#include "chrome/common/gfx/chrome_canvas.h"
#include "chrome/common/win_util.h"
#include "chrome/views/focus_manager.h"
#include "chrome/views/scroll_view.h"
#include "chrome/views/widget.h"
#include "base/logging.h"
namespace views {
static const char kViewClassName[] = "chrome/views/HWNDView";
HWNDView::HWNDView() :
hwnd_(0),
installed_clip_(false),
fast_resize_(false),
focus_view_(NULL) {
// HWNDs are placed relative to the root. As such, we need to
// know when the position of any ancestor changes, or our visibility relative
// to other views changed as it'll effect our position relative to the root.
SetNotifyWhenVisibleBoundsInRootChanges(true);
}
HWNDView::~HWNDView() {
}
void HWNDView::Attach(HWND hwnd) {
DCHECK(hwnd_ == NULL);
DCHECK(hwnd) << "Impossible detatched tab case; See crbug.com/6316";
hwnd_ = 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()->GetHWND());
UpdateHWNDBounds();
// Register with the focus manager so the associated view is focused when the
// native control gets the focus.
FocusManager::InstallFocusSubclass(hwnd_, focus_view_ ? focus_view_ : this);
}
void HWNDView::Detach() {
DCHECK(hwnd_);
FocusManager::UninstallFocusSubclass(hwnd_);
hwnd_ = NULL;
installed_clip_ = false;
}
void HWNDView::SetAssociatedFocusView(View* view) {
DCHECK(!::IsWindow(hwnd_));
focus_view_ = view;
}
HWND HWNDView::GetHWND() const {
return hwnd_;
}
void HWNDView::UpdateHWNDBounds() {
if (!hwnd_)
return;
// Since HWNDs know nothing about the View hierarchy (they are direct
// children of the Widget that hosts our View hierarchy) they need to be
// positioned in the coordinate system of the Widget, not the current
// view.
gfx::Point top_left;
ConvertPointToWidget(this, &top_left);
gfx::Rect vis_bounds = GetVisibleBounds();
bool visible = !vis_bounds.IsEmpty();
if (visible && !fast_resize_) {
if (vis_bounds.size() != size()) {
// Only a portion of the HWND is really visible.
int x = vis_bounds.x();
int y = vis_bounds.y();
HRGN clip_region = CreateRectRgn(x, y, x + vis_bounds.width(),
y + vis_bounds.height());
// NOTE: SetWindowRgn owns the region (as well as the deleting the
// current region), as such we don't delete the old region.
SetWindowRgn(hwnd_, clip_region, FALSE);
installed_clip_ = true;
} else if (installed_clip_) {
// The whole HWND is visible but we installed a clip on the HWND,
// uninstall it.
SetWindowRgn(hwnd_, 0, FALSE);
installed_clip_ = false;
}
}
if (visible) {
UINT swp_flags;
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(hwnd_))
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(hwnd_, &rect);
::SetWindowPos(hwnd_, 0, top_left.x(), top_left.y(), rect.Width(),
rect.Height(), swp_flags);
HRGN clip_region = CreateRectRgn(0, 0, width(), height());
SetWindowRgn(hwnd_, clip_region, FALSE);
installed_clip_ = true;
} else {
::SetWindowPos(hwnd_, 0, top_left.x(), top_left.y(), width(), height(),
swp_flags);
}
} else if (::IsWindowVisible(hwnd_)) {
// The window is currently visible, but its clipped by another view. Hide
// it.
::SetWindowPos(hwnd_, 0, 0, 0, 0, 0,
SWP_HIDEWINDOW | SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER |
SWP_NOREDRAW | SWP_NOOWNERZORDER );
}
}
void HWNDView::DidChangeBounds(const gfx::Rect& previous,
const gfx::Rect& current) {
// TODO(beng): (Cleanup) Could UpdateHWNDBounds be replaced by a Layout
// method and this function gotten rid of?
UpdateHWNDBounds();
}
void HWNDView::VisibilityChanged(View* starting_from, bool is_visible) {
UpdateHWNDBounds();
}
gfx::Size HWNDView::GetPreferredSize() {
return preferred_size_;
}
void HWNDView::ViewHierarchyChanged(bool is_add, View *parent, View *child) {
if (hwnd_) {
Widget* widget = GetWidget();
if (is_add && widget) {
HWND parent = ::GetParent(hwnd_);
HWND widget_hwnd = widget->GetHWND();
if (parent != widget_hwnd) {
::SetParent(hwnd_, widget_hwnd);
}
if (IsVisibleInRootView())
::ShowWindow(hwnd_, SW_SHOW);
else
::ShowWindow(hwnd_, SW_HIDE);
UpdateHWNDBounds();
} else if (!is_add) {
::ShowWindow(hwnd_, SW_HIDE);
::SetParent(hwnd_, NULL);
}
}
}
void HWNDView::VisibleBoundsInRootChanged() {
UpdateHWNDBounds();
}
void HWNDView::Focus() {
::SetFocus(hwnd_);
}
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;
}
} // namespace views
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