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// Copyright (c) 2009 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/native_control_win.h"
#include "app/l10n_util_win.h"
#include "base/logging.h"
#include "base/win_util.h"
namespace views {
// static
const wchar_t* NativeControlWin::kNativeControlWinKey =
L"__NATIVE_CONTROL_WIN__";
static const wchar_t* kNativeControlOriginalWndProcKey =
L"__NATIVE_CONTROL_ORIGINAL_WNDPROC__";
// static
WNDPROC NativeControlWin::original_wndproc_ = NULL;
////////////////////////////////////////////////////////////////////////////////
// NativeControlWin, public:
NativeControlWin::NativeControlWin() : HWNDView() {
}
NativeControlWin::~NativeControlWin() {
HWND hwnd = GetHWND();
if (hwnd) {
// Destroy the hwnd if it still exists. Otherwise we won't have shut things
// down correctly, leading to leaking and crashing if another message
// comes in for the hwnd.
Detach();
DestroyWindow(hwnd);
}
}
bool NativeControlWin::ProcessMessage(UINT message, WPARAM w_param,
LPARAM l_param, LRESULT* result) {
switch (message) {
case WM_CONTEXTMENU:
ShowContextMenu(gfx::Point(LOWORD(l_param), HIWORD(l_param)));
*result = 0;
return true;
case WM_CTLCOLORBTN:
case WM_CTLCOLORSTATIC:
*result = GetControlColor(message, reinterpret_cast<HDC>(w_param),
GetHWND());
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
// NativeControlWin, View overrides:
void NativeControlWin::SetEnabled(bool enabled) {
if (IsEnabled() != enabled) {
View::SetEnabled(enabled);
if (GetHWND())
EnableWindow(GetHWND(), IsEnabled());
}
}
void NativeControlWin::ViewHierarchyChanged(bool is_add, View* parent,
View* child) {
// Create the HWND when we're added to a valid Widget. Many controls need a
// parent HWND to function properly.
if (is_add && GetWidget() && !GetHWND())
CreateNativeControl();
// Call the base class to hide the view if we're being removed.
HWNDView::ViewHierarchyChanged(is_add, parent, child);
}
void NativeControlWin::VisibilityChanged(View* starting_from, bool is_visible) {
if (!is_visible) {
// We destroy the child control HWND when we become invisible because of the
// performance cost of maintaining many HWNDs.
HWND hwnd = GetHWND();
Detach();
DestroyWindow(hwnd);
} else if (!GetHWND()) {
CreateNativeControl();
}
}
void NativeControlWin::Focus() {
DCHECK(GetHWND());
SetFocus(GetHWND());
}
////////////////////////////////////////////////////////////////////////////////
// NativeControlWin, protected:
void NativeControlWin::ShowContextMenu(const gfx::Point& location) {
if (!GetContextMenuController())
return;
int x = location.x();
int y = location.y();
bool is_mouse = true;
if (x == -1 && y == -1) {
gfx::Point point = GetKeyboardContextMenuLocation();
x = point.x();
y = point.y();
is_mouse = false;
}
View::ShowContextMenu(x, y, is_mouse);
}
void NativeControlWin::NativeControlCreated(HWND native_control) {
// Associate this object with the control's HWND so that WidgetWin can find
// this object when it receives messages from it.
SetProp(native_control, kNativeControlWinKey, this);
// Subclass the window so we can monitor for key presses.
original_wndproc_ =
win_util::SetWindowProc(native_control,
&NativeControlWin::NativeControlWndProc);
SetProp(native_control, kNativeControlOriginalWndProcKey, original_wndproc_);
Attach(native_control);
// GetHWND() is now valid.
// Update the newly created HWND with any resident enabled state.
EnableWindow(GetHWND(), IsEnabled());
// This message ensures that the focus border is shown.
SendMessage(GetHWND(), WM_CHANGEUISTATE,
MAKEWPARAM(UIS_CLEAR, UISF_HIDEFOCUS), 0);
}
DWORD NativeControlWin::GetAdditionalExStyle() const {
// If the UI for the view is mirrored, we should make sure we add the
// extended window style for a right-to-left layout so the subclass creates
// a mirrored HWND for the underlying control.
DWORD ex_style = 0;
if (UILayoutIsRightToLeft())
ex_style |= l10n_util::GetExtendedStyles();
return ex_style;
}
DWORD NativeControlWin::GetAdditionalRTLStyle() const {
// If the UI for the view is mirrored, we should make sure we add the
// extended window style for a right-to-left layout so the subclass creates
// a mirrored HWND for the underlying control.
DWORD ex_style = 0;
if (UILayoutIsRightToLeft())
ex_style |= l10n_util::GetExtendedTooltipStyles();
return ex_style;
}
////////////////////////////////////////////////////////////////////////////////
// NativeControlWin, private:
LRESULT NativeControlWin::GetControlColor(UINT message, HDC dc, HWND sender) {
View *ancestor = this;
while (ancestor) {
const Background* background = ancestor->background();
if (background) {
HBRUSH brush = background->GetNativeControlBrush();
if (brush)
return reinterpret_cast<LRESULT>(brush);
}
ancestor = ancestor->GetParent();
}
// COLOR_BTNFACE is the default for dialog box backgrounds.
return reinterpret_cast<LRESULT>(GetSysColorBrush(COLOR_BTNFACE));
}
// static
LRESULT NativeControlWin::NativeControlWndProc(HWND window,
UINT message,
WPARAM w_param,
LPARAM l_param) {
NativeControlWin* native_control =
static_cast<NativeControlWin*>(GetProp(window, kNativeControlWinKey));
DCHECK(native_control);
if (message == WM_KEYDOWN && native_control->NotifyOnKeyDown()) {
if (native_control->OnKeyDown(static_cast<int>(w_param)))
return 0;
} else if (message == WM_DESTROY) {
win_util::SetWindowProc(window, native_control->original_wndproc_);
RemoveProp(window, kNativeControlWinKey);
}
return CallWindowProc(native_control->original_wndproc_, window, message,
w_param, l_param);
}
} // namespace views
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