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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.
#ifndef UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
#define UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/views/controls/button/custom_button.h"
#include "ui/views/controls/image_view.h"
#include "ui/views/controls/label.h"
#include "ui/views/native_theme_delegate.h"
namespace views {
class LabelButtonBorder;
class Painter;
// LabelButton is a button with text and an icon, it's not focusable by default.
class VIEWS_EXPORT LabelButton : public CustomButton,
public NativeThemeDelegate {
public:
// The length of the hover fade animation.
static const int kHoverAnimationDurationMs;
static const char kViewClassName[];
LabelButton(ButtonListener* listener, const base::string16& text);
~LabelButton() override;
// Get or set the image shown for the specified button state.
// GetImage returns the image for STATE_NORMAL if the state's image is empty.
virtual const gfx::ImageSkia& GetImage(ButtonState for_state);
void SetImage(ButtonState for_state, const gfx::ImageSkia& image);
// Get or set the text shown on the button.
const base::string16& GetText() const;
virtual void SetText(const base::string16& text);
// Set the text color shown for the specified button state.
void SetTextColor(ButtonState for_state, SkColor color);
// Set drop shadows underneath the text.
void SetTextShadows(const gfx::ShadowValues& shadows);
// Sets whether subpixel rendering is used on the label.
void SetTextSubpixelRenderingEnabled(bool enabled);
// Get or set the text's multi-line property to break on '\n', etc.
bool GetTextMultiLine() const;
void SetTextMultiLine(bool text_multi_line);
// Get or set the font list used by this button.
const gfx::FontList& GetFontList() const;
void SetFontList(const gfx::FontList& font_list);
// Set the elide behavior of this button.
void SetElideBehavior(gfx::ElideBehavior elide_behavior);
// Get or set the horizontal alignment used for the button; reversed in RTL.
// The optional image will lead the text, unless the button is right-aligned.
gfx::HorizontalAlignment GetHorizontalAlignment() const;
void SetHorizontalAlignment(gfx::HorizontalAlignment alignment);
// Call SetMinSize(gfx::Size()) to clear the monotonically increasing size.
void SetMinSize(const gfx::Size& min_size);
void SetMaxSize(const gfx::Size& max_size);
// Get or set the option to handle the return key; false by default.
bool is_default() const { return is_default_; }
void SetIsDefault(bool is_default);
// Get or set the button's overall style; the default is |STYLE_TEXTBUTTON|.
ButtonStyle style() const { return style_; }
void SetStyle(ButtonStyle style);
// Set the spacing between the image and the text. Shrinking the spacing
// will not shrink the overall button size, as it is monotonically increasing.
// Call SetMinSize(gfx::Size()) to clear the size if needed.
void SetImageLabelSpacing(int spacing);
void SetFocusPainter(scoped_ptr<Painter> focus_painter);
Painter* focus_painter() { return focus_painter_.get(); }
// View:
void SetBorder(scoped_ptr<Border> border) override;
gfx::Size GetPreferredSize() const override;
int GetHeightForWidth(int w) const override;
void Layout() override;
const char* GetClassName() const override;
protected:
ImageView* image() const { return image_; }
Label* label() const { return label_; }
// Returns the available area for the label and image. Subclasses can change
// these bounds if they need room to do manual painting.
virtual gfx::Rect GetChildAreaBounds();
// View:
void OnPaint(gfx::Canvas* canvas) override;
void OnFocus() override;
void OnBlur() override;
void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
// Fill |params| with information about the button.
virtual void GetExtraParams(ui::NativeTheme::ExtraParams* params) const;
// Resets colors from the NativeTheme, explicitly set colors are unchanged.
virtual void ResetColorsFromNativeTheme();
// Creates the default border for this button. This can be overridden by
// subclasses or by LinuxUI.
virtual scoped_ptr<LabelButtonBorder> CreateDefaultBorder() const;
// Updates the image view to contain the appropriate button state image.
void UpdateImage();
// Updates the border as per the NativeTheme, unless a different border was
// set with SetBorder.
void UpdateThemedBorder();
// NativeThemeDelegate:
gfx::Rect GetThemePaintRect() const override;
private:
FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Init);
FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Label);
FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Image);
FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, LabelAndImage);
FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, FontList);
// CustomButton:
void StateChanged() override;
// View:
void ChildPreferredSizeChanged(View* child) override;
// NativeThemeDelegate:
ui::NativeTheme::Part GetThemePart() const override;
ui::NativeTheme::State GetThemeState(
ui::NativeTheme::ExtraParams* params) const override;
const gfx::Animation* GetThemeAnimation() const override;
ui::NativeTheme::State GetBackgroundThemeState(
ui::NativeTheme::ExtraParams* params) const override;
ui::NativeTheme::State GetForegroundThemeState(
ui::NativeTheme::ExtraParams* params) const override;
// Resets |cached_preferred_size_| and marks |cached_preferred_size_valid_|
// as false.
void ResetCachedPreferredSize();
// The image and label shown in the button.
ImageView* image_;
Label* label_;
// The cached font lists in the normal and bold style.
gfx::FontList cached_normal_font_list_;
gfx::FontList cached_bold_font_list_;
// The images and colors for each button state.
gfx::ImageSkia button_state_images_[STATE_COUNT];
SkColor button_state_colors_[STATE_COUNT];
// Used to track whether SetTextColor() has been invoked.
bool explicitly_set_colors_[STATE_COUNT];
// |min_size_| increases monotonically with the preferred size.
mutable gfx::Size min_size_;
// |max_size_| may be set to clamp the preferred size.
gfx::Size max_size_;
// Cache the last computed preferred size.
mutable gfx::Size cached_preferred_size_;
mutable bool cached_preferred_size_valid_;
// Flag indicating default handling of the return key via an accelerator.
// Whether or not the button appears or behaves as the default button in its
// current context;
bool is_default_;
// The button's overall style.
ButtonStyle style_;
// True if current border was set by UpdateThemedBorder. Defaults to true.
bool border_is_themed_border_;
// Spacing between the image and the text.
int image_label_spacing_;
scoped_ptr<Painter> focus_painter_;
DISALLOW_COPY_AND_ASSIGN(LabelButton);
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
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