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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/combobox/combobox.h"
#include <stddef.h>
#include <utility>
#include "base/logging.h"
#include "base/macros.h"
#include "build/build_config.h"
#include "ui/accessibility/ax_action_data.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/base/default_style.h"
#include "ui/base/ime/input_method.h"
#include "ui/base/models/combobox_model_observer.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/events/event.h"
#include "ui/gfx/animation/throb_animation.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_palette.h"
#include "ui/gfx/scoped_canvas.h"
#include "ui/gfx/text_utils.h"
#include "ui/native_theme/common_theme.h"
#include "ui/native_theme/native_theme.h"
#include "ui/native_theme/native_theme_aura.h"
#include "ui/resources/grit/ui_resources.h"
#include "ui/views/animation/flood_fill_ink_drop_ripple.h"
#include "ui/views/animation/ink_drop_highlight.h"
#include "ui/views/animation/ink_drop_impl.h"
#include "ui/views/background.h"
#include "ui/views/controls/button/button.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/controls/combobox/combobox_listener.h"
#include "ui/views/controls/focus_ring.h"
#include "ui/views/controls/focusable_border.h"
#include "ui/views/controls/menu/menu_config.h"
#include "ui/views/controls/menu/menu_runner.h"
#include "ui/views/controls/prefix_selector.h"
#include "ui/views/controls/textfield/textfield.h"
#include "ui/views/layout/layout_provider.h"
#include "ui/views/mouse_constants.h"
#include "ui/views/painter.h"
#include "ui/views/resources/grit/views_resources.h"
#include "ui/views/style/platform_style.h"
#include "ui/views/widget/widget.h"
namespace views {
namespace {
// STYLE_ACTION arrow container padding widths.
const int kActionLeftPadding = 12;
const int kActionRightPadding = 11;
// Menu border widths
const int kMenuBorderWidthLeft = 1;
const int kMenuBorderWidthTop = 1;
const int kMenuBorderWidthRight = 1;
// Limit how small a combobox can be.
const int kMinComboboxWidth = 25;
// Define the id of the first item in the menu (since it needs to be > 0)
const int kFirstMenuItemId = 1000;
// Used to indicate that no item is currently selected by the user.
const int kNoSelection = -1;
const int kBodyButtonImages[] = IMAGE_GRID(IDR_COMBOBOX_BUTTON);
const int kHoveredBodyButtonImages[] = IMAGE_GRID(IDR_COMBOBOX_BUTTON_H);
const int kPressedBodyButtonImages[] = IMAGE_GRID(IDR_COMBOBOX_BUTTON_P);
const int kFocusedBodyButtonImages[] = IMAGE_GRID(IDR_COMBOBOX_BUTTON_F);
const int kFocusedHoveredBodyButtonImages[] =
IMAGE_GRID(IDR_COMBOBOX_BUTTON_F_H);
const int kFocusedPressedBodyButtonImages[] =
IMAGE_GRID(IDR_COMBOBOX_BUTTON_F_P);
#define MENU_IMAGE_GRID(x) { \
x ## _MENU_TOP, x ## _MENU_CENTER, x ## _MENU_BOTTOM, }
const int kMenuButtonImages[] = MENU_IMAGE_GRID(IDR_COMBOBOX_BUTTON);
const int kHoveredMenuButtonImages[] = MENU_IMAGE_GRID(IDR_COMBOBOX_BUTTON_H);
const int kPressedMenuButtonImages[] = MENU_IMAGE_GRID(IDR_COMBOBOX_BUTTON_P);
const int kFocusedMenuButtonImages[] = MENU_IMAGE_GRID(IDR_COMBOBOX_BUTTON_F);
const int kFocusedHoveredMenuButtonImages[] =
MENU_IMAGE_GRID(IDR_COMBOBOX_BUTTON_F_H);
const int kFocusedPressedMenuButtonImages[] =
MENU_IMAGE_GRID(IDR_COMBOBOX_BUTTON_F_P);
#undef MENU_IMAGE_GRID
SkColor GetTextColorForEnableState(const Combobox& combobox, bool enabled) {
return style::GetColor(
combobox, style::CONTEXT_TEXTFIELD,
enabled ? style::STYLE_PRIMARY : style::STYLE_DISABLED);
}
gfx::Rect PositionArrowWithinContainer(const gfx::Rect& container_bounds,
const gfx::Size& arrow_size,
Combobox::Style style) {
gfx::Rect bounds(container_bounds);
if (style == Combobox::STYLE_ACTION) {
// This positions the arrow horizontally. The later call to
// ClampToCenteredSize will position it vertically without touching the
// horizontal position.
bounds.Inset(kActionLeftPadding, 0, kActionRightPadding, 0);
DCHECK_EQ(bounds.width(), arrow_size.width());
}
bounds.ClampToCenteredSize(arrow_size);
return bounds;
}
// The transparent button which holds a button state but is not rendered.
class TransparentButton : public Button {
public:
TransparentButton(ButtonListener* listener, bool animate_state_change)
: Button(listener) {
set_animate_on_state_change(animate_state_change);
if (animate_state_change)
SetAnimationDuration(LabelButton::kHoverAnimationDurationMs);
SetFocusBehavior(FocusBehavior::NEVER);
set_notify_action(PlatformStyle::kMenuNotifyActivationAction);
SetInkDropMode(InkDropMode::ON);
set_has_ink_drop_action_on_click(true);
}
~TransparentButton() override {}
bool OnMousePressed(const ui::MouseEvent& mouse_event) override {
#if !defined(OS_MACOSX)
// On Mac, comboboxes do not take focus on mouse click, but on other
// platforms they do.
parent()->RequestFocus();
#endif
return Button::OnMousePressed(mouse_event);
}
double GetAnimationValue() const {
return hover_animation().GetCurrentValue();
}
// Overridden from InkDropHost:
std::unique_ptr<InkDrop> CreateInkDrop() override {
std::unique_ptr<views::InkDropImpl> ink_drop = CreateDefaultInkDropImpl();
ink_drop->SetShowHighlightOnHover(false);
return std::move(ink_drop);
}
std::unique_ptr<InkDropRipple> CreateInkDropRipple() const override {
return std::unique_ptr<views::InkDropRipple>(
new views::FloodFillInkDropRipple(
size(), GetInkDropCenterBasedOnLastEvent(),
GetNativeTheme()->GetSystemColor(
ui::NativeTheme::kColorId_LabelEnabledColor),
ink_drop_visible_opacity()));
}
private:
DISALLOW_COPY_AND_ASSIGN(TransparentButton);
};
#if !defined(OS_MACOSX)
// Returns the next or previous valid index (depending on |increment|'s value).
// Skips separator or disabled indices. Returns -1 if there is no valid adjacent
// index.
int GetAdjacentIndex(ui::ComboboxModel* model, int increment, int index) {
DCHECK(increment == -1 || increment == 1);
index += increment;
while (index >= 0 && index < model->GetItemCount()) {
if (!model->IsItemSeparatorAt(index) || !model->IsItemEnabledAt(index))
return index;
index += increment;
}
return kNoSelection;
}
#endif
// Returns the image resource ids of an array for the body button.
//
// TODO(hajimehoshi): This function should return the images for the 'disabled'
// status. (crbug/270052)
const int* GetBodyButtonImageIds(bool focused,
Button::ButtonState state,
size_t* num) {
DCHECK(num);
*num = 9;
switch (state) {
case Button::STATE_DISABLED:
return focused ? kFocusedBodyButtonImages : kBodyButtonImages;
case Button::STATE_NORMAL:
return focused ? kFocusedBodyButtonImages : kBodyButtonImages;
case Button::STATE_HOVERED:
return focused ?
kFocusedHoveredBodyButtonImages : kHoveredBodyButtonImages;
case Button::STATE_PRESSED:
return focused ?
kFocusedPressedBodyButtonImages : kPressedBodyButtonImages;
default:
NOTREACHED();
}
return NULL;
}
// Returns the image resource ids of an array for the menu button.
const int* GetMenuButtonImageIds(bool focused,
Button::ButtonState state,
size_t* num) {
DCHECK(num);
*num = 3;
switch (state) {
case Button::STATE_DISABLED:
return focused ? kFocusedMenuButtonImages : kMenuButtonImages;
case Button::STATE_NORMAL:
return focused ? kFocusedMenuButtonImages : kMenuButtonImages;
case Button::STATE_HOVERED:
return focused ?
kFocusedHoveredMenuButtonImages : kHoveredMenuButtonImages;
case Button::STATE_PRESSED:
return focused ?
kFocusedPressedMenuButtonImages : kPressedMenuButtonImages;
default:
NOTREACHED();
}
return NULL;
}
// Returns the images for the menu buttons.
std::vector<const gfx::ImageSkia*> GetMenuButtonImages(
bool focused,
Button::ButtonState state) {
const int* ids;
size_t num_ids;
ids = GetMenuButtonImageIds(focused, state, &num_ids);
std::vector<const gfx::ImageSkia*> images;
images.reserve(num_ids);
ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
for (size_t i = 0; i < num_ids; i++)
images.push_back(rb.GetImageSkiaNamed(ids[i]));
return images;
}
// Paints three images in a column at the given location. The center image is
// stretched so as to fit the given height.
void PaintImagesVertically(gfx::Canvas* canvas,
const gfx::ImageSkia& top_image,
const gfx::ImageSkia& center_image,
const gfx::ImageSkia& bottom_image,
int x, int y, int width, int height) {
canvas->DrawImageInt(top_image,
0, 0, top_image.width(), top_image.height(),
x, y, width, top_image.height(), false);
y += top_image.height();
int center_height = height - top_image.height() - bottom_image.height();
canvas->DrawImageInt(center_image,
0, 0, center_image.width(), center_image.height(),
x, y, width, center_height, false);
y += center_height;
canvas->DrawImageInt(bottom_image,
0, 0, bottom_image.width(), bottom_image.height(),
x, y, width, bottom_image.height(), false);
}
// Paints the arrow button.
void PaintArrowButton(
gfx::Canvas* canvas,
const std::vector<const gfx::ImageSkia*>& arrow_button_images,
int x, int height) {
PaintImagesVertically(canvas,
*arrow_button_images[0],
*arrow_button_images[1],
*arrow_button_images[2],
x, 0, arrow_button_images[0]->width(), height);
}
} // namespace
// static
const char Combobox::kViewClassName[] = "views/Combobox";
// Adapts a ui::ComboboxModel to a ui::MenuModel.
class Combobox::ComboboxMenuModel : public ui::MenuModel,
public ui::ComboboxModelObserver {
public:
ComboboxMenuModel(Combobox* owner, ui::ComboboxModel* model)
: owner_(owner), model_(model) {
model_->AddObserver(this);
}
~ComboboxMenuModel() override { model_->RemoveObserver(this); }
private:
bool UseCheckmarks() const {
return owner_->style_ != STYLE_ACTION &&
MenuConfig::instance().check_selected_combobox_item;
}
// Overridden from MenuModel:
bool HasIcons() const override { return false; }
int GetItemCount() const override { return model_->GetItemCount(); }
ItemType GetTypeAt(int index) const override {
if (model_->IsItemSeparatorAt(index)) {
// In action menus, disallow <item>, <separator>, ... since that would put
// a separator at the top of the menu.
DCHECK(index != 1 || owner_->style_ != STYLE_ACTION);
return TYPE_SEPARATOR;
}
return UseCheckmarks() ? TYPE_CHECK : TYPE_COMMAND;
}
ui::MenuSeparatorType GetSeparatorTypeAt(int index) const override {
return ui::NORMAL_SEPARATOR;
}
int GetCommandIdAt(int index) const override {
return index + kFirstMenuItemId;
}
base::string16 GetLabelAt(int index) const override {
// Inserting the Unicode formatting characters if necessary so that the
// text is displayed correctly in right-to-left UIs.
base::string16 text = model_->GetItemAt(index);
base::i18n::AdjustStringForLocaleDirection(&text);
return text;
}
bool IsItemDynamicAt(int index) const override { return true; }
const gfx::FontList* GetLabelFontListAt(int index) const override {
return &GetFontList();
}
bool GetAcceleratorAt(int index,
ui::Accelerator* accelerator) const override {
return false;
}
bool IsItemCheckedAt(int index) const override {
return UseCheckmarks() && index == owner_->selected_index_;
}
int GetGroupIdAt(int index) const override { return -1; }
bool GetIconAt(int index, gfx::Image* icon) override { return false; }
ui::ButtonMenuItemModel* GetButtonMenuItemAt(int index) const override {
return nullptr;
}
bool IsEnabledAt(int index) const override {
return model_->IsItemEnabledAt(index);
}
bool IsVisibleAt(int index) const override {
// When STYLE_ACTION is used, the first item is not added to the menu. It is
// assumed that the first item is always selected and rendered on the top of
// the action button.
return index > 0 || owner_->style_ != STYLE_ACTION;
}
void HighlightChangedTo(int index) override {}
void ActivatedAt(int index) override {
owner_->selected_index_ = index;
owner_->OnPerformAction();
}
void ActivatedAt(int index, int event_flags) override { ActivatedAt(index); }
MenuModel* GetSubmenuModelAt(int index) const override { return nullptr; }
void SetMenuModelDelegate(
ui::MenuModelDelegate* menu_model_delegate) override {}
ui::MenuModelDelegate* GetMenuModelDelegate() const override {
return nullptr;
}
// Overridden from ComboboxModelObserver:
void OnComboboxModelChanged(ui::ComboboxModel* model) override {
owner_->ModelChanged();
}
Combobox* owner_; // Weak. Owns this.
ui::ComboboxModel* model_; // Weak.
DISALLOW_COPY_AND_ASSIGN(ComboboxMenuModel);
};
////////////////////////////////////////////////////////////////////////////////
// Combobox, public:
Combobox::Combobox(std::unique_ptr<ui::ComboboxModel> model, Style style)
: Combobox(model.get(), style) {
owned_model_ = std::move(model);
}
Combobox::Combobox(ui::ComboboxModel* model, Style style)
: model_(model),
style_(style),
listener_(nullptr),
selected_index_(style == STYLE_ACTION ? 0 : model_->GetDefaultIndex()),
invalid_(false),
menu_model_(new ComboboxMenuModel(this, model)),
text_button_(new TransparentButton(this, style_ == STYLE_ACTION)),
arrow_button_(new TransparentButton(this, style_ == STYLE_ACTION)),
size_to_largest_label_(style_ == STYLE_NORMAL),
weak_ptr_factory_(this) {
ModelChanged();
#if defined(OS_MACOSX)
SetFocusBehavior(FocusBehavior::ACCESSIBLE_ONLY);
#else
SetFocusBehavior(FocusBehavior::ALWAYS);
#endif
UpdateBorder();
// Initialize the button images.
Button::ButtonState button_states[] = {
Button::STATE_DISABLED,
Button::STATE_NORMAL,
Button::STATE_HOVERED,
Button::STATE_PRESSED,
};
for (int i = 0; i < 2; i++) {
for (size_t state_index = 0; state_index < arraysize(button_states);
state_index++) {
Button::ButtonState state = button_states[state_index];
size_t num;
bool focused = !!i;
const int* ids = GetBodyButtonImageIds(focused, state, &num);
body_button_painters_[focused][state] =
Painter::CreateImageGridPainter(ids);
menu_button_images_[focused][state] = GetMenuButtonImages(focused, state);
}
}
text_button_->SetVisible(true);
arrow_button_->SetVisible(true);
AddChildView(text_button_);
AddChildView(arrow_button_);
// A layer is applied to make sure that canvas bounds are snapped to pixel
// boundaries (for the sake of drawing the arrow).
SetPaintToLayer();
layer()->SetFillsBoundsOpaquely(false);
focus_ring_ = FocusRing::Install(this);
}
Combobox::~Combobox() {
if (GetInputMethod() && selector_.get()) {
// Combobox should have been blurred before destroy.
DCHECK(selector_.get() != GetInputMethod()->GetTextInputClient());
}
}
// static
const gfx::FontList& Combobox::GetFontList() {
ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
return rb.GetFontListWithDelta(ui::kLabelFontSizeDelta);
}
void Combobox::ModelChanged() {
// If the selection is no longer valid (or the model is empty), restore the
// default index.
if (selected_index_ >= model_->GetItemCount() ||
model_->GetItemCount() == 0 ||
model_->IsItemSeparatorAt(selected_index_)) {
selected_index_ = model_->GetDefaultIndex();
}
content_size_ = GetContentSize();
PreferredSizeChanged();
SchedulePaint();
}
void Combobox::SetSelectedIndex(int index) {
if (style_ == STYLE_ACTION)
return;
selected_index_ = index;
if (size_to_largest_label_) {
SchedulePaint();
} else {
content_size_ = GetContentSize();
PreferredSizeChanged();
}
}
bool Combobox::SelectValue(const base::string16& value) {
if (style_ == STYLE_ACTION)
return false;
for (int i = 0; i < model()->GetItemCount(); ++i) {
if (value == model()->GetItemAt(i)) {
SetSelectedIndex(i);
return true;
}
}
return false;
}
void Combobox::SetTooltipText(const base::string16& tooltip_text) {
arrow_button_->SetTooltipText(tooltip_text);
if (accessible_name_.empty())
accessible_name_ = tooltip_text;
}
void Combobox::SetAccessibleName(const base::string16& name) {
accessible_name_ = name;
}
void Combobox::SetInvalid(bool invalid) {
if (invalid == invalid_)
return;
invalid_ = invalid;
if (focus_ring_)
focus_ring_->SetInvalid(invalid);
UpdateBorder();
SchedulePaint();
}
void Combobox::Layout() {
View::Layout();
int text_button_width = 0;
int arrow_button_width = 0;
switch (style_) {
case STYLE_NORMAL: {
arrow_button_width = width();
break;
}
case STYLE_ACTION: {
arrow_button_width = GetArrowContainerWidth();
text_button_width = width() - arrow_button_width;
break;
}
}
int arrow_button_x = std::max(0, text_button_width);
text_button_->SetBounds(0, 0, std::max(0, text_button_width), height());
arrow_button_->SetBounds(arrow_button_x, 0, arrow_button_width, height());
}
void Combobox::OnNativeThemeChanged(const ui::NativeTheme* theme) {
SetBackground(
CreateBackgroundFromPainter(Painter::CreateSolidRoundRectPainter(
theme->GetSystemColor(
ui::NativeTheme::kColorId_TextfieldDefaultBackground),
FocusableBorder::kCornerRadiusDp)));
}
int Combobox::GetRowCount() {
return model()->GetItemCount();
}
int Combobox::GetSelectedRow() {
return selected_index_;
}
void Combobox::SetSelectedRow(int row) {
int prev_index = selected_index_;
SetSelectedIndex(row);
if (selected_index_ != prev_index)
OnPerformAction();
}
base::string16 Combobox::GetTextForRow(int row) {
return model()->IsItemSeparatorAt(row) ? base::string16() :
model()->GetItemAt(row);
}
////////////////////////////////////////////////////////////////////////////////
// Combobox, View overrides:
gfx::Size Combobox::CalculatePreferredSize() const {
// The preferred size will drive the local bounds which in turn is used to set
// the minimum width for the dropdown list.
gfx::Insets insets = GetInsets();
const LayoutProvider* provider = LayoutProvider::Get();
insets += gfx::Insets(
provider->GetDistanceMetric(DISTANCE_CONTROL_VERTICAL_TEXT_PADDING),
provider->GetDistanceMetric(DISTANCE_TEXTFIELD_HORIZONTAL_TEXT_PADDING));
int total_width = std::max(kMinComboboxWidth, content_size_.width()) +
insets.width() + GetArrowContainerWidth();
return gfx::Size(total_width, content_size_.height() + insets.height());
}
const char* Combobox::GetClassName() const {
return kViewClassName;
}
bool Combobox::SkipDefaultKeyEventProcessing(const ui::KeyEvent& e) {
// Escape should close the drop down list when it is active, not host UI.
if (e.key_code() != ui::VKEY_ESCAPE ||
e.IsShiftDown() || e.IsControlDown() || e.IsAltDown()) {
return false;
}
return !!menu_runner_;
}
bool Combobox::OnKeyPressed(const ui::KeyEvent& e) {
// TODO(oshima): handle IME.
DCHECK_EQ(e.type(), ui::ET_KEY_PRESSED);
DCHECK_GE(selected_index_, 0);
DCHECK_LT(selected_index_, model()->GetItemCount());
if (selected_index_ < 0 || selected_index_ > model()->GetItemCount())
selected_index_ = 0;
bool show_menu = false;
int new_index = kNoSelection;
switch (e.key_code()) {
#if defined(OS_MACOSX)
case ui::VKEY_DOWN:
case ui::VKEY_UP:
case ui::VKEY_SPACE:
case ui::VKEY_HOME:
case ui::VKEY_END:
// On Mac, navigation keys should always just show the menu first.
show_menu = true;
break;
#else
// Show the menu on F4 without modifiers.
case ui::VKEY_F4:
if (e.IsAltDown() || e.IsAltGrDown() || e.IsControlDown())
return false;
show_menu = true;
break;
// Move to the next item if any, or show the menu on Alt+Down like Windows.
case ui::VKEY_DOWN:
if (e.IsAltDown())
show_menu = true;
else
new_index = GetAdjacentIndex(model(), 1, selected_index_);
break;
// Move to the end of the list.
case ui::VKEY_END:
case ui::VKEY_NEXT: // Page down.
new_index = GetAdjacentIndex(model(), -1, model()->GetItemCount());
break;
// Move to the beginning of the list.
case ui::VKEY_HOME:
case ui::VKEY_PRIOR: // Page up.
new_index = GetAdjacentIndex(model(), 1, -1);
break;
// Move to the previous item if any.
case ui::VKEY_UP:
new_index = GetAdjacentIndex(model(), -1, selected_index_);
break;
case ui::VKEY_SPACE:
if (style_ == STYLE_ACTION) {
// When pressing space, the click event will be raised after the key is
// released.
text_button_->SetState(Button::STATE_PRESSED);
} else {
show_menu = true;
}
break;
case ui::VKEY_RETURN:
if (style_ == STYLE_ACTION)
OnPerformAction();
else
show_menu = true;
break;
#endif // OS_MACOSX
default:
return false;
}
if (show_menu) {
ShowDropDownMenu(ui::MENU_SOURCE_KEYBOARD);
} else if (new_index != selected_index_ && new_index != kNoSelection &&
style_ != STYLE_ACTION) {
DCHECK(!model()->IsItemSeparatorAt(new_index));
selected_index_ = new_index;
OnPerformAction();
}
return true;
}
bool Combobox::OnKeyReleased(const ui::KeyEvent& e) {
if (style_ != STYLE_ACTION)
return false; // crbug.com/127520
if (e.key_code() == ui::VKEY_SPACE && style_ == STYLE_ACTION &&
text_button_->state() == Button::STATE_PRESSED)
OnPerformAction();
return false;
}
void Combobox::OnPaint(gfx::Canvas* canvas) {
switch (style_) {
case STYLE_NORMAL: {
OnPaintBackground(canvas);
PaintText(canvas);
OnPaintBorder(canvas);
break;
}
case STYLE_ACTION: {
PaintButtons(canvas);
PaintText(canvas);
break;
}
}
}
void Combobox::OnFocus() {
if (GetInputMethod())
GetInputMethod()->SetFocusedTextInputClient(GetPrefixSelector());
View::OnFocus();
// Border renders differently when focused.
SchedulePaint();
}
void Combobox::OnBlur() {
if (GetInputMethod())
GetInputMethod()->DetachTextInputClient(GetPrefixSelector());
if (selector_)
selector_->OnViewBlur();
// Border renders differently when focused.
SchedulePaint();
}
void Combobox::GetAccessibleNodeData(ui::AXNodeData* node_data) {
// ax::mojom::Role::kComboBox is for UI elements with a dropdown and
// an editable text field, which views::Combobox does not have. Use
// ax::mojom::Role::kPopUpButton to match an HTML <select> element.
node_data->role = ax::mojom::Role::kPopUpButton;
node_data->SetName(accessible_name_);
node_data->SetValue(model_->GetItemAt(selected_index_));
if (enabled()) {
node_data->SetDefaultActionVerb(ax::mojom::DefaultActionVerb::kOpen);
}
node_data->AddIntAttribute(ax::mojom::IntAttribute::kPosInSet,
selected_index_);
node_data->AddIntAttribute(ax::mojom::IntAttribute::kSetSize,
model_->GetItemCount());
}
bool Combobox::HandleAccessibleAction(const ui::AXActionData& action_data) {
// The action handling in View would generate a mouse event and send it to
// |this|. However, mouse events for Combobox are handled by |arrow_button_|,
// which is hidden from the a11y tree (so can't expose actions). Rather than
// forwarding ax::mojom::Action::kDoDefault to View and then forwarding the
// mouse event it generates to |arrow_button_| to have it forward back to
// |this| (as its ButtonListener), just handle the action explicitly here and
// bypass View.
if (enabled() && action_data.action == ax::mojom::Action::kDoDefault) {
ShowDropDownMenu(ui::MENU_SOURCE_KEYBOARD);
return true;
}
return View::HandleAccessibleAction(action_data);
}
void Combobox::ButtonPressed(Button* sender, const ui::Event& event) {
if (!enabled())
return;
if (sender == text_button_) {
OnPerformAction();
} else {
DCHECK_EQ(arrow_button_, sender);
// TODO(hajimehoshi): Fix the problem that the arrow button blinks when
// cliking this while the dropdown menu is opened.
const base::TimeDelta delta = base::Time::Now() - closed_time_;
if (delta.InMilliseconds() <= kMinimumMsBetweenButtonClicks)
return;
ui::MenuSourceType source_type = ui::MENU_SOURCE_MOUSE;
if (event.IsKeyEvent())
source_type = ui::MENU_SOURCE_KEYBOARD;
else if (event.IsGestureEvent() || event.IsTouchEvent())
source_type = ui::MENU_SOURCE_TOUCH;
ShowDropDownMenu(source_type);
}
}
void Combobox::UpdateBorder() {
std::unique_ptr<FocusableBorder> border(new FocusableBorder());
if (style_ == STYLE_ACTION)
border->SetInsets(5, 10, 5, 10);
if (invalid_)
border->SetColorId(ui::NativeTheme::kColorId_AlertSeverityHigh);
SetBorder(std::move(border));
}
void Combobox::AdjustBoundsForRTLUI(gfx::Rect* rect) const {
rect->set_x(GetMirroredXForRect(*rect));
}
void Combobox::PaintText(gfx::Canvas* canvas) {
gfx::Insets insets = GetInsets();
insets += gfx::Insets(0, LayoutProvider::Get()->GetDistanceMetric(
DISTANCE_TEXTFIELD_HORIZONTAL_TEXT_PADDING));
gfx::ScopedCanvas scoped_canvas(canvas);
canvas->ClipRect(GetContentsBounds());
int x = insets.left();
int y = insets.top();
int text_height = height() - insets.height();
SkColor text_color = GetTextColorForEnableState(*this, enabled());
DCHECK_GE(selected_index_, 0);
DCHECK_LT(selected_index_, model()->GetItemCount());
if (selected_index_ < 0 || selected_index_ > model()->GetItemCount())
selected_index_ = 0;
base::string16 text = model()->GetItemAt(selected_index_);
int disclosure_arrow_offset = width() - GetArrowContainerWidth();
const gfx::FontList& font_list = Combobox::GetFontList();
int text_width = gfx::GetStringWidth(text, font_list);
if ((text_width + insets.width()) > disclosure_arrow_offset)
text_width = disclosure_arrow_offset - insets.width();
gfx::Rect text_bounds(x, y, text_width, text_height);
AdjustBoundsForRTLUI(&text_bounds);
canvas->DrawStringRect(text, font_list, text_color, text_bounds);
gfx::Rect arrow_bounds(disclosure_arrow_offset, 0, GetArrowContainerWidth(),
height());
arrow_bounds =
PositionArrowWithinContainer(arrow_bounds, ArrowSize(), style_);
AdjustBoundsForRTLUI(&arrow_bounds);
{
// Since this is a core piece of UI and vector icons don't handle fractional
// scale factors particularly well, manually draw an arrow and make sure it
// looks good at all scale factors.
float dsf = canvas->UndoDeviceScaleFactor();
SkScalar x = std::ceil(arrow_bounds.x() * dsf);
SkScalar y = std::ceil(arrow_bounds.y() * dsf);
SkScalar height = std::floor(arrow_bounds.height() * dsf);
SkPath path;
// This epsilon makes sure that all the aliasing pixels are slightly more
// than half full. Otherwise, rounding issues cause some to be considered
// slightly less than half full and come out a little lighter.
const SkScalar kEpsilon = 0.0001f;
path.moveTo(x - kEpsilon, y);
path.rLineTo(height, height);
path.rLineTo(2 * kEpsilon, 0);
path.rLineTo(height, -height);
path.close();
cc::PaintFlags flags;
SkColor arrow_color = GetTextColorForEnableState(*this, true);
if (!enabled())
arrow_color = SkColorSetA(arrow_color, gfx::kDisabledControlAlpha);
flags.setColor(arrow_color);
flags.setAntiAlias(true);
canvas->DrawPath(path, flags);
}
}
void Combobox::PaintButtons(gfx::Canvas* canvas) {
DCHECK(style_ == STYLE_ACTION);
gfx::ScopedRTLFlipCanvas scoped_canvas(canvas, width());
bool focused = HasFocus();
const std::vector<const gfx::ImageSkia*>& arrow_button_images =
menu_button_images_[focused][
arrow_button_->state() == Button::STATE_HOVERED ?
Button::STATE_NORMAL : arrow_button_->state()];
int text_button_hover_alpha =
text_button_->state() == Button::STATE_PRESSED ? 0 :
static_cast<int>(static_cast<TransparentButton*>(text_button_)->
GetAnimationValue() * 255);
if (text_button_hover_alpha < 255) {
canvas->SaveLayerAlpha(255 - text_button_hover_alpha);
Painter* text_button_painter =
body_button_painters_[focused][
text_button_->state() == Button::STATE_HOVERED ?
Button::STATE_NORMAL : text_button_->state()].get();
Painter::PaintPainterAt(canvas, text_button_painter,
gfx::Rect(0, 0, text_button_->width(), height()));
canvas->Restore();
}
if (0 < text_button_hover_alpha) {
canvas->SaveLayerAlpha(text_button_hover_alpha);
Painter* text_button_hovered_painter =
body_button_painters_[focused][Button::STATE_HOVERED].get();
Painter::PaintPainterAt(canvas, text_button_hovered_painter,
gfx::Rect(0, 0, text_button_->width(), height()));
canvas->Restore();
}
int arrow_button_hover_alpha =
arrow_button_->state() == Button::STATE_PRESSED ? 0 :
static_cast<int>(static_cast<TransparentButton*>(arrow_button_)->
GetAnimationValue() * 255);
if (arrow_button_hover_alpha < 255) {
canvas->SaveLayerAlpha(255 - arrow_button_hover_alpha);
PaintArrowButton(canvas, arrow_button_images, arrow_button_->x(), height());
canvas->Restore();
}
if (0 < arrow_button_hover_alpha) {
canvas->SaveLayerAlpha(arrow_button_hover_alpha);
const std::vector<const gfx::ImageSkia*>& arrow_button_hovered_images =
menu_button_images_[focused][Button::STATE_HOVERED];
PaintArrowButton(canvas, arrow_button_hovered_images,
arrow_button_->x(), height());
canvas->Restore();
}
}
void Combobox::ShowDropDownMenu(ui::MenuSourceType source_type) {
gfx::Rect lb = GetLocalBounds();
gfx::Point menu_position(lb.origin());
if (style_ == STYLE_NORMAL) {
// Inset the menu's requested position so the border of the menu lines up
// with the border of the combobox.
menu_position.set_x(menu_position.x() + kMenuBorderWidthLeft);
menu_position.set_y(menu_position.y() + kMenuBorderWidthTop);
}
lb.set_width(lb.width() - (kMenuBorderWidthLeft + kMenuBorderWidthRight));
View::ConvertPointToScreen(this, &menu_position);
gfx::Rect bounds(menu_position, lb.size());
Button::ButtonState original_state = Button::STATE_NORMAL;
if (arrow_button_) {
original_state = arrow_button_->state();
arrow_button_->SetState(Button::STATE_PRESSED);
}
MenuAnchorPosition anchor_position =
style_ == STYLE_ACTION ? MENU_ANCHOR_TOPRIGHT : MENU_ANCHOR_TOPLEFT;
// Allow |menu_runner_| to be set by the testing API, but if this method is
// ever invoked recursively, ensure the old menu is closed.
if (!menu_runner_ || menu_runner_->IsRunning()) {
menu_runner_.reset(
new MenuRunner(menu_model_.get(), MenuRunner::COMBOBOX,
base::Bind(&Combobox::OnMenuClosed,
base::Unretained(this), original_state)));
}
menu_runner_->RunMenuAt(GetWidget(), nullptr, bounds, anchor_position,
source_type);
}
void Combobox::OnMenuClosed(Button::ButtonState original_button_state) {
menu_runner_.reset();
if (arrow_button_)
arrow_button_->SetState(original_button_state);
closed_time_ = base::Time::Now();
}
void Combobox::OnPerformAction() {
NotifyAccessibilityEvent(ax::mojom::Event::kValueChanged, true);
SchedulePaint();
// This combobox may be deleted by the listener.
base::WeakPtr<Combobox> weak_ptr = weak_ptr_factory_.GetWeakPtr();
if (listener_)
listener_->OnPerformAction(this);
if (weak_ptr && style_ == STYLE_ACTION)
selected_index_ = 0;
}
gfx::Size Combobox::ArrowSize() const {
return gfx::Size(8, 4);
}
gfx::Size Combobox::GetContentSize() const {
const gfx::FontList& font_list = GetFontList();
int width = 0;
for (int i = 0; i < model()->GetItemCount(); ++i) {
if (model_->IsItemSeparatorAt(i))
continue;
if (size_to_largest_label_ || i == selected_index_) {
width = std::max(
width, gfx::GetStringWidth(menu_model_->GetLabelAt(i), font_list));
}
}
return gfx::Size(width, font_list.GetHeight());
}
PrefixSelector* Combobox::GetPrefixSelector() {
if (!selector_)
selector_.reset(new PrefixSelector(this, this));
return selector_.get();
}
int Combobox::GetArrowContainerWidth() const {
constexpr int kPaddingWidth = 8;
int padding = style_ == STYLE_NORMAL
? kPaddingWidth * 2
: kActionLeftPadding + kActionRightPadding;
return ArrowSize().width() + padding;
}
} // namespace views
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