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// Copyright (c) 2010 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/button/button_dropdown.h"
#include "app/l10n_util.h"
#include "base/compiler_specific.h"
#include "base/message_loop.h"
#include "grit/app_strings.h"
#include "views/controls/menu/view_menu_delegate.h"
#include "views/widget/widget.h"
namespace views {
// How long to wait before showing the menu
static const int kMenuTimerDelay = 500;
////////////////////////////////////////////////////////////////////////////////
//
// ButtonDropDown - constructors, destructors, initialization, cleanup
//
////////////////////////////////////////////////////////////////////////////////
ButtonDropDown::ButtonDropDown(ButtonListener* listener,
menus::MenuModel* model)
: ImageButton(listener),
model_(model),
y_position_on_lbuttondown_(0),
ALLOW_THIS_IN_INITIALIZER_LIST(show_menu_factory_(this)) {
}
ButtonDropDown::~ButtonDropDown() {
}
////////////////////////////////////////////////////////////////////////////////
//
// ButtonDropDown - Events
//
////////////////////////////////////////////////////////////////////////////////
bool ButtonDropDown::OnMousePressed(const MouseEvent& e) {
if (IsEnabled() && IsTriggerableEvent(e) && HitTest(e.location())) {
// Store the y pos of the mouse coordinates so we can use them later to
// determine if the user dragged the mouse down (which should pop up the
// drag down menu immediately, instead of waiting for the timer)
y_position_on_lbuttondown_ = e.y();
// Schedule a task that will show the menu.
MessageLoop::current()->PostDelayedTask(FROM_HERE,
show_menu_factory_.NewRunnableMethod(&ButtonDropDown::ShowDropDownMenu,
GetWidget()->GetNativeView()),
kMenuTimerDelay);
}
return ImageButton::OnMousePressed(e);
}
void ButtonDropDown::OnMouseReleased(const MouseEvent& e, bool canceled) {
if (IsTriggerableEvent(e) ||
(e.IsRightMouseButton() && !HitTest(e.location()))) {
ImageButton::OnMouseReleased(e, canceled);
}
if (canceled)
return;
if (IsTriggerableEvent(e))
show_menu_factory_.RevokeAll();
if (IsEnabled() && e.IsRightMouseButton() && HitTest(e.location())) {
show_menu_factory_.RevokeAll();
ShowDropDownMenu(GetWidget()->GetNativeView());
// Set the state back to normal after the drop down menu is closed.
if (state_ != BS_DISABLED)
SetState(BS_NORMAL);
}
}
bool ButtonDropDown::OnMouseDragged(const MouseEvent& e) {
bool result = ImageButton::OnMouseDragged(e);
if (!show_menu_factory_.empty()) {
// If the mouse is dragged to a y position lower than where it was when
// clicked then we should not wait for the menu to appear but show
// it immediately.
if (e.y() > y_position_on_lbuttondown_ + GetHorizontalDragThreshold()) {
show_menu_factory_.RevokeAll();
ShowDropDownMenu(GetWidget()->GetNativeView());
}
}
return result;
}
void ButtonDropDown::OnMouseExited(const MouseEvent& e) {
// Starting a drag results in a MouseExited, we need to ignore it.
// A right click release triggers an exit event. We want to
// remain in a PUSHED state until the drop down menu closes.
if (state_ != BS_DISABLED && !InDrag() && state_ != BS_PUSHED)
SetState(BS_NORMAL);
}
////////////////////////////////////////////////////////////////////////////////
//
// ButtonDropDown - Menu functions
//
////////////////////////////////////////////////////////////////////////////////
void ButtonDropDown::ShowContextMenu(const gfx::Point& p,
bool is_mouse_gesture) {
show_menu_factory_.RevokeAll();
// Make the button look depressed while the menu is open.
// NOTE: SetState() schedules a paint, but it won't occur until after the
// context menu message loop has terminated, so we PaintNow() to
// update the appearance synchronously.
SetState(BS_PUSHED);
PaintNow();
ShowDropDownMenu(GetWidget()->GetNativeView());
SetState(BS_HOT);
}
bool ButtonDropDown::ShouldEnterPushedState(const MouseEvent& e) {
// Enter PUSHED state on press with Left or Right mouse button. Remain
// in this state while the context menu is open.
return ((MouseEvent::EF_LEFT_BUTTON_DOWN |
MouseEvent::EF_RIGHT_BUTTON_DOWN) & e.GetFlags()) != 0;
}
void ButtonDropDown::ShowDropDownMenu(gfx::NativeView window) {
if (model_) {
gfx::Rect lb = GetLocalBounds(true);
// Both the menu position and the menu anchor type change if the UI layout
// is right-to-left.
gfx::Point menu_position(lb.origin());
menu_position.Offset(0, lb.height() - 1);
if (base::i18n::IsRTL())
menu_position.Offset(lb.width() - 1, 0);
View::ConvertPointToScreen(this, &menu_position);
#if defined(OS_WIN)
int left_bound = GetSystemMetrics(SM_XVIRTUALSCREEN);
#else
int left_bound = 0;
NOTIMPLEMENTED();
#endif
if (menu_position.x() < left_bound)
menu_position.set_x(left_bound);
menu_.reset(new Menu2(model_));
menu_->RunMenuAt(menu_position, Menu2::ALIGN_TOPLEFT);
// Need to explicitly clear mouse handler so that events get sent
// properly after the menu finishes running. If we don't do this, then
// the first click to other parts of the UI is eaten.
SetMouseHandler(NULL);
}
}
////////////////////////////////////////////////////////////////////////////////
//
// ButtonDropDown - Accessibility
//
////////////////////////////////////////////////////////////////////////////////
std::wstring ButtonDropDown::GetAccessibleDefaultAction() {
return l10n_util::GetString(IDS_APP_ACCACTION_PRESS);
}
AccessibilityTypes::Role ButtonDropDown::GetAccessibleRole() {
return AccessibilityTypes::ROLE_BUTTONDROPDOWN;
}
AccessibilityTypes::State ButtonDropDown::GetAccessibleState() {
return AccessibilityTypes::STATE_HASPOPUP;
}
} // namespace views
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