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// Copyright (c) 2011 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.
#import "chrome/browser/ui/cocoa/image_button_cell.h"
#include "base/logging.h"
#include "base/mac/mac_util.h"
#import "chrome/browser/themes/theme_service.h"
#import "chrome/browser/ui/cocoa/rect_path_utils.h"
#import "chrome/browser/ui/cocoa/themed_window.h"
#import "ui/base/cocoa/nsview_additions.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
// When the window doesn't have focus then we want to draw the button with a
// slightly lighter color. We do this by just reducing the alpha.
const CGFloat kImageNoFocusAlpha = 0.65;
@interface ImageButtonCell (Private)
- (void)sharedInit;
- (image_button_cell::ButtonState)currentButtonState;
- (NSImage*)imageForID:(NSInteger)imageID
controlView:(NSView*)controlView;
@end
@implementation ImageButtonCell
@synthesize isMouseInside = isMouseInside_;
// For nib instantiations
- (id)initWithCoder:(NSCoder*)decoder {
if ((self = [super initWithCoder:decoder])) {
[self sharedInit];
}
return self;
}
// For programmatic instantiations
- (id)initTextCell:(NSString*)string {
if ((self = [super initTextCell:string])) {
[self sharedInit];
}
return self;
}
- (void)sharedInit {
[self setHighlightsBy:NSNoCellMask];
// We need to set this so that we can override |-mouseEntered:| and
// |-mouseExited:| to change the button image on hover states.
[self setShowsBorderOnlyWhileMouseInside:YES];
}
- (NSImage*)imageForState:(image_button_cell::ButtonState)state
view:(NSView*)controlView{
if (image_[state].imageId)
return [self imageForID:image_[state].imageId controlView:controlView];
return image_[state].image;
}
- (void)drawImageWithFrame:(NSRect)cellFrame inView:(NSView*)controlView {
image_button_cell::ButtonState state = [self currentButtonState];
BOOL windowHasFocus = [[controlView window] isMainWindow] ||
[[controlView window] isKeyWindow];
CGFloat alpha = [self imageAlphaForWindowState:[controlView window]];
NSImage* image = [self imageForState:state view:controlView];
if (!windowHasFocus) {
NSImage* defaultImage = [self
imageForState:image_button_cell::kDefaultStateBackground
view:controlView];
NSImage* hoverImage = [self
imageForState:image_button_cell::kHoverStateBackground
view:controlView];
if ([self currentButtonState] == image_button_cell::kDefaultState &&
defaultImage) {
image = defaultImage;
alpha = 1.0;
} else if ([self currentButtonState] == image_button_cell::kHoverState &&
hoverImage) {
image = hoverImage;
alpha = 1.0;
}
}
NSRect imageRect;
imageRect.size = [image size];
imageRect.origin.x = cellFrame.origin.x +
roundf((NSWidth(cellFrame) - NSWidth(imageRect)) / 2.0);
imageRect.origin.y = cellFrame.origin.y +
roundf((NSHeight(cellFrame) - NSHeight(imageRect)) / 2.0);
[image drawInRect:imageRect
fromRect:NSZeroRect
operation:NSCompositeSourceOver
fraction:alpha
respectFlipped:YES
hints:nil];
}
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView*)controlView {
[self drawImageWithFrame:cellFrame inView:controlView];
}
- (void)setImageID:(NSInteger)imageID
forButtonState:(image_button_cell::ButtonState)state {
DCHECK_GE(state, 0);
DCHECK_LT(state, image_button_cell::kButtonStateCount);
image_[state].image.reset();
image_[state].imageId = imageID;
[[self controlView] setNeedsDisplay:YES];
}
// Sets the image for the given button state using an image.
- (void)setImage:(NSImage*)image
forButtonState:(image_button_cell::ButtonState)state {
DCHECK_GE(state, 0);
DCHECK_LT(state, image_button_cell::kButtonStateCount);
image_[state].image.reset([image retain]);
image_[state].imageId = 0;
[[self controlView] setNeedsDisplay:YES];
}
- (CGFloat)imageAlphaForWindowState:(NSWindow*)window {
BOOL windowHasFocus = [window isMainWindow] || [window isKeyWindow];
return windowHasFocus ? 1.0 : kImageNoFocusAlpha;
}
- (const ui::ThemeProvider*)themeProviderForWindow:(NSWindow*)window {
return [window themeProvider];
}
- (image_button_cell::ButtonState)currentButtonState {
bool (^has)(image_button_cell::ButtonState) =
^(image_button_cell::ButtonState state) {
return image_[state].image || image_[state].imageId;
};
if (![self isEnabled] && has(image_button_cell::kDisabledState))
return image_button_cell::kDisabledState;
if ([self isHighlighted] && has(image_button_cell::kPressedState))
return image_button_cell::kPressedState;
if ([self isMouseInside] && has(image_button_cell::kHoverState))
return image_button_cell::kHoverState;
return image_button_cell::kDefaultState;
}
- (NSImage*)imageForID:(NSInteger)imageID
controlView:(NSView*)controlView {
if (!imageID)
return nil;
const ui::ThemeProvider* themeProvider =
[self themeProviderForWindow:[controlView window]];
if (!themeProvider)
return nil;
return themeProvider->GetNSImageNamed(imageID);
}
- (void)setIsMouseInside:(BOOL)isMouseInside {
if (isMouseInside_ != isMouseInside) {
isMouseInside_ = isMouseInside;
NSView<ImageButton>* control =
static_cast<NSView<ImageButton>*>([self controlView]);
if ([control respondsToSelector:@selector(mouseInsideStateDidChange:)]) {
[control mouseInsideStateDidChange:isMouseInside];
}
[control setNeedsDisplay:YES];
}
}
- (void)setShowsBorderOnlyWhileMouseInside:(BOOL)show {
VLOG_IF(1, !show) << "setShowsBorderOnlyWhileMouseInside:NO ignored";
}
- (BOOL)showsBorderOnlyWhileMouseInside {
// Always returns YES so that buttons always get mouse tracking even when
// disabled. The reload button (and possibly others) depend on this.
return YES;
}
- (void)mouseEntered:(NSEvent*)theEvent {
[self setIsMouseInside:YES];
}
- (void)mouseExited:(NSEvent*)theEvent {
[self setIsMouseInside:NO];
}
@end
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