Implement input type=color UI (mac part)

chrome/browser/ui/cocoa/color_chooser_mac.mm

+// 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.
+
+#include "chrome/browser/ui/color_chooser.h"
+#include "chrome/browser/ui/cocoa/color_utils.h"
+
+#if defined(ENABLE_INPUT_COLOR)
+
+#import "base/mac/cocoa_protocols.h"
+
+#import <Cocoa/Cocoa.h>
+
+// A Listener class to act as a event target for NSColorPanel and send
+// the results to the C++ class, ColorChooserImpl.
+@interface ColorPanelBridge : NSObject<NSWindowDelegate>
+
++ (ColorPanelBridge*)sharedBridge;
+
+// Called from NSColorPanel
+- (void)didChooseColor:(NSColorPanel *)panel;
+
+@end
+
+class ColorChooserImpl : public ColorChooser {
+public:
+  // Get the singleton instance of this class.
+  static ColorChooserImpl* GetInstance();
+
+  virtual ~ColorChooserImpl();
+
+  // Called from ColorPanelBridge
+  void didChooseColor(WebKit::WebColor color);
+  void cleanup();
+
+protected:
+  virtual void openImpl(Listener* listener, WebKit::WebColor initial_color);
+  virtual void cleanupImpl(Listener* listener);
+  void setSelectedColorImpl(WebKit::WebColor color);
+
+private:
+  ColorChooser::Listener* listener_;
+};
+
+ColorChooser* ColorChooser::GetInstance() {
+  return ColorChooserImpl::GetInstance();
+}
+
+ColorChooserImpl* ColorChooserImpl::GetInstance() {
+  return Singleton<ColorChooserImpl>::get();
+}
+
+ColorChooserImpl::~ColorChooserImpl()
+{
+  cleanupImpl(listener_);
+}
+
+void ColorChooserImpl::didChooseColor(WebKit::WebColor color) {
+  if (!listener_)
+    return;
+  listener_->DidChooseColor(color);
+}
+
+void ColorChooserImpl::openImpl(Listener* listener,
+                                WebKit::WebColor initial_color) {
+  listener_ = listener;
+  NSColorPanel* panel = [NSColorPanel sharedColorPanel];
+  [panel setColor:NSColorFromWebColor(initial_color)];
+  [panel setShowsAlpha:NO];
+  [panel setDelegate:[ColorPanelBridge sharedBridge]];
+  [panel setTarget:[ColorPanelBridge sharedBridge]];
+  [panel setAction:@selector(didChooseColor:)];
+  [panel makeKeyAndOrderFront:NULL];
+}
+
+void ColorChooserImpl::cleanup() {
+  NSColorPanel* panel = [NSColorPanel sharedColorPanel];
+  [panel setDelegate:nil];
+  [panel setTarget:nil];
+  [panel setAction:NULL];
+  if (!listener_)
+    return;
+  listener_->DidCleanup();
+  listener_ = 0;
+}
+
+void ColorChooserImpl::cleanupImpl(Listener* listener) {
+  if (listener_ != listener)
+    return;
+  cleanup();
+}
+
+void ColorChooserImpl::setSelectedColorImpl(WebKit::WebColor color) {
+  NSColorPanel* panel = [NSColorPanel sharedColorPanel];
+  [panel setColor:NSColorFromWebColor(color)];
+}
+
+@implementation ColorPanelBridge
+
+static ColorPanelBridge *sharedColorPanelBridge = nil;
+
++ (ColorPanelBridge*)sharedBridge {
+  if (!sharedColorPanelBridge)
+    sharedColorPanelBridge = [[ColorPanelBridge alloc] init];
+  return sharedColorPanelBridge;
+}
+
+- (void)windowWillClose:(NSNotification *)notification {
+  ColorChooserImpl::GetInstance()->cleanup();
+}
+
+- (void)didChooseColor:(NSColorPanel *)panel {
+  ColorChooserImpl::GetInstance()->didChooseColor(WebColorFromNSColor(
+      [[panel color] colorUsingColorSpaceName:NSDeviceRGBColorSpace]));
+}
+
+@end
+
+#endif // defined(ENABLE_INPUT_COLOR)