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// Copyright 2014 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 "chrome/browser/ui/libgtk2ui/gtk2_border.h"
#include <gtk/gtk.h>
#include "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
#include "third_party/skia/include/effects/SkLerpXfermode.h"
#include "ui/gfx/animation/animation.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia_source.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/skia_util.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/native_theme_delegate.h"
using views::Button;
using views::NativeThemeDelegate;
namespace libgtk2ui {
namespace {
const int kNumberOfFocusedStates = 2;
GtkStateType GetGtkState(ui::NativeTheme::State state) {
switch (state) {
case ui::NativeTheme::kDisabled: return GTK_STATE_INSENSITIVE;
case ui::NativeTheme::kHovered: return GTK_STATE_PRELIGHT;
case ui::NativeTheme::kNormal: return GTK_STATE_NORMAL;
case ui::NativeTheme::kPressed: return GTK_STATE_ACTIVE;
case ui::NativeTheme::kMaxState: NOTREACHED() << "Unknown state: " << state;
}
return GTK_STATE_NORMAL;
}
class ButtonImageSkiaSource : public gfx::ImageSkiaSource {
public:
ButtonImageSkiaSource(const Gtk2UI* gtk2_ui,
const GtkStateType state,
const bool focused,
const gfx::Size& size)
: gtk2_ui_(gtk2_ui),
state_(state),
focused_(focused),
size_(size) {
}
virtual ~ButtonImageSkiaSource() {
}
virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
int w = size_.width() * scale;
int h = size_.height() * scale;
return gfx::ImageSkiaRep(
gtk2_ui_->DrawGtkButtonBorder(state_, focused_, w, h), scale);
}
private:
const Gtk2UI* gtk2_ui_;
const GtkStateType state_;
const bool focused_;
const gfx::Size size_;
DISALLOW_COPY_AND_ASSIGN(ButtonImageSkiaSource);
};
} // namespace
Gtk2Border::Gtk2Border(Gtk2UI* gtk2_ui,
views::LabelButton* owning_button,
scoped_ptr<views::Border> border)
: gtk2_ui_(gtk2_ui),
use_gtk_(gtk2_ui_->GetUseSystemTheme()),
owning_button_(owning_button),
border_(border.Pass()) {
gtk2_ui_->AddGtkBorder(this);
}
Gtk2Border::~Gtk2Border() {
gtk2_ui_->RemoveGtkBorder(this);
}
void Gtk2Border::InvalidateAndSetUsesGtk(bool use_gtk) {
for (int i = 0; i < kNumberOfFocusedStates; ++i) {
for (int j = 0; j < views::Button::STATE_COUNT; ++j) {
button_images_[i][j] = gfx::ImageSkia();
}
}
// Our owning view must have its layout invalidated because the insets could
// have changed.
owning_button_->InvalidateLayout();
use_gtk_ = use_gtk;
}
void Gtk2Border::Paint(const views::View& view, gfx::Canvas* canvas) {
if (!use_gtk_) {
border_->Paint(view, canvas);
return;
}
DCHECK_EQ(&view, owning_button_);
const NativeThemeDelegate* native_theme_delegate = owning_button_;
gfx::Rect rect(native_theme_delegate->GetThemePaintRect());
ui::NativeTheme::ExtraParams extra;
ui::NativeTheme::State state = native_theme_delegate->GetThemeState(&extra);
const gfx::Animation* animation = native_theme_delegate->GetThemeAnimation();
if (animation && animation->is_animating()) {
// Linearly interpolate background and foreground painters during animation.
const SkRect sk_rect = gfx::RectToSkRect(rect);
canvas->sk_canvas()->saveLayer(&sk_rect, NULL);
state = native_theme_delegate->GetBackgroundThemeState(&extra);
PaintState(state, extra, rect, canvas);
SkPaint paint;
skia::RefPtr<SkXfermode> sk_lerp_xfer =
skia::AdoptRef(SkLerpXfermode::Create(animation->GetCurrentValue()));
paint.setXfermode(sk_lerp_xfer.get());
canvas->sk_canvas()->saveLayer(&sk_rect, &paint);
state = native_theme_delegate->GetForegroundThemeState(&extra);
PaintState(state, extra, rect, canvas);
canvas->sk_canvas()->restore();
canvas->sk_canvas()->restore();
} else {
PaintState(state, extra, rect, canvas);
}
}
gfx::Insets Gtk2Border::GetInsets() const {
if (!use_gtk_)
return border_->GetInsets();
return gtk2_ui_->GetButtonInsets();
}
gfx::Size Gtk2Border::GetMinimumSize() const {
if (!use_gtk_)
return border_->GetMinimumSize();
gfx::Insets insets = GetInsets();
return gfx::Size(insets.width(), insets.height());
}
void Gtk2Border::PaintState(const ui::NativeTheme::State state,
const ui::NativeTheme::ExtraParams& extra,
const gfx::Rect& rect,
gfx::Canvas* canvas) {
bool focused = extra.button.is_focused;
Button::ButtonState views_state = Button::GetButtonStateFrom(state);
if (ShouldDrawBorder(focused, views_state)) {
gfx::ImageSkia* image = &button_images_[focused][views_state];
if (image->isNull() || image->size() != rect.size()) {
GtkStateType gtk_state = GetGtkState(state);
*image = gfx::ImageSkia(
new ButtonImageSkiaSource(gtk2_ui_, gtk_state, focused, rect.size()),
rect.size());
}
canvas->DrawImageInt(*image, rect.x(), rect.y());
}
}
bool Gtk2Border::ShouldDrawBorder(bool focused,
views::Button::ButtonState state) {
// This logic should be kept in sync with the LabelButtonBorder constructor.
if (owning_button_->style() == Button::STYLE_BUTTON) {
return true;
} else if (owning_button_->style() == Button::STYLE_TEXTBUTTON) {
return focused == false && (state == Button::STATE_HOVERED ||
state == Button::STATE_PRESSED);
}
return false;
}
} // namespace libgtk2ui
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