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// 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/controls/native_control_win.h"
#include <windowsx.h>
#include "base/logging.h"
#include "ui/base/accessibility/accessibility_types.h"
#include "ui/base/l10n/l10n_util_win.h"
#include "ui/base/view_prop.h"
#include "ui/base/win/hwnd_util.h"
#include "ui/views/controls/combobox/combobox.h"
#include "ui/views/focus/focus_manager.h"
#include "ui/views/widget/widget.h"
using ui::ViewProp;
const char kNativeControlWinKey[] = "__NATIVE_CONTROL_WIN__";
namespace views {
////////////////////////////////////////////////////////////////////////////////
// NativeControlWin, public:
NativeControlWin::NativeControlWin() : original_wndproc_(NULL) {
}
NativeControlWin::~NativeControlWin() {
HWND hwnd = native_view();
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(GET_X_LPARAM(l_param), GET_Y_LPARAM(l_param)));
*result = 0;
return true;
case WM_CTLCOLORBTN:
case WM_CTLCOLORSTATIC:
*result = GetControlColor(message, reinterpret_cast<HDC>(w_param),
native_view());
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
// NativeControlWin, View overrides:
void NativeControlWin::OnEnabledChanged() {
View::OnEnabledChanged();
if (native_view())
EnableWindow(native_view(), enabled());
}
void NativeControlWin::ViewHierarchyChanged(
const ViewHierarchyChangedDetails& details) {
// Call the base class to hide the view if we're being removed.
NativeViewHost::ViewHierarchyChanged(details);
// Create the HWND when we're added to a valid Widget. Many controls need a
// parent HWND to function properly.
if (details.is_add && GetWidget() && !native_view())
CreateNativeControl();
}
void NativeControlWin::VisibilityChanged(View* starting_from, bool is_visible) {
// We might get called due to visibility changes at any point in the
// hierarchy, lets check whether we are really visible or not.
bool is_drawn = IsDrawn();
if (!is_drawn && native_view()) {
// We destroy the child control HWND when we become invisible because of the
// performance cost of maintaining many HWNDs.
HWND hwnd = native_view();
Detach();
DestroyWindow(hwnd);
} else if (is_drawn && !native_view()) {
if (GetWidget())
CreateNativeControl();
}
if (is_drawn) {
// The view becomes visible after native control is created.
// Layout now.
Layout();
}
}
void NativeControlWin::OnFocus() {
DCHECK(native_view());
SetFocus(native_view());
// Since we are being wrapped by a view, accessibility should receive
// the super class as the focused view.
View* parent_view = parent();
// Due to some controls not behaving as expected without having
// a native win32 control, we don't always send a native (MSAA)
// focus notification.
bool send_native_event =
strcmp(parent_view->GetClassName(), Combobox::kViewClassName) &&
parent_view->HasFocus();
// Send the accessibility focus notification.
parent_view->NotifyAccessibilityEvent(
ui::AccessibilityTypes::EVENT_FOCUS, send_native_event);
}
////////////////////////////////////////////////////////////////////////////////
// NativeControlWin, protected:
void NativeControlWin::ShowContextMenu(const gfx::Point& location) {
if (!context_menu_controller())
return;
if (location.x() == -1 && location.y() == -1) {
View::ShowContextMenu(GetKeyboardContextMenuLocation(),
ui::MENU_SOURCE_KEYBOARD);
} else {
View::ShowContextMenu(location, ui::MENU_SOURCE_MOUSE);
}
}
void NativeControlWin::NativeControlCreated(HWND native_control) {
// Associate this object with the control's HWND so that NativeWidgetWin can
// find this object when it receives messages from it.
props_.push_back(new ViewProp(native_control, kNativeControlWinKey, this));
props_.push_back(ChildWindowMessageProcessor::Register(native_control, this));
// Subclass so we get WM_KEYDOWN and WM_SETFOCUS messages.
original_wndproc_ = ui::SetWindowProc(
native_control, &NativeControlWin::NativeControlWndProc);
Attach(native_control);
// native_view() is now valid.
// Update the newly created HWND with any resident enabled state.
EnableWindow(native_view(), enabled());
// This message ensures that the focus border is shown.
SendMessage(native_view(), 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 (base::i18n::IsRTL())
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 (base::i18n::IsRTL())
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->parent();
}
// 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 = reinterpret_cast<NativeControlWin*>(
ViewProp::GetValue(window, kNativeControlWinKey));
DCHECK(native_control);
if (message == WM_KEYDOWN &&
native_control->OnKeyDown(static_cast<int>(w_param))) {
return 0;
} else if (message == WM_SETFOCUS) {
// Let the focus manager know that the focus changed.
FocusManager* focus_manager = native_control->GetFocusManager();
if (focus_manager) {
focus_manager->SetFocusedView(native_control->focus_view());
} else {
NOTREACHED();
}
} else if (message == WM_DESTROY) {
native_control->props_.clear();
ui::SetWindowProc(window, native_control->original_wndproc_);
}
return CallWindowProc(native_control->original_wndproc_, window, message,
w_param, l_param);
}
} // namespace views
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