michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <gtk/gtk.h>
michael@0: 
michael@0: #include "nsColor.h"
michael@0: #include "nsColorPicker.h"
michael@0: #include "nsGtkUtils.h"
michael@0: #include "nsIWidget.h"
michael@0: #include "WidgetUtils.h"
michael@0: 
michael@0: NS_IMPL_ISUPPORTS(nsColorPicker, nsIColorPicker)
michael@0: 
michael@0: int nsColorPicker::convertGdkColorComponent(guint16 color_component) {
michael@0:   // GdkColor value is in range [0..65535]. We need something in range [0..255]
michael@0:   return (color_component * 255 + 127) / 65535;
michael@0: }
michael@0: 
michael@0: guint16 nsColorPicker::convertToGdkColorComponent(int color_component) {
michael@0:   return color_component * 65535 / 255;
michael@0: }
michael@0: 
michael@0: GdkColor nsColorPicker::convertToGdkColor(nscolor color) {
michael@0:   GdkColor result = { 0 /* obsolete, unused 'pixel' value */,
michael@0:       convertToGdkColorComponent(NS_GET_R(color)),
michael@0:       convertToGdkColorComponent(NS_GET_G(color)),
michael@0:       convertToGdkColorComponent(NS_GET_B(color)) };
michael@0: 
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: GtkColorSelection* nsColorPicker::WidgetGetColorSelection(GtkWidget* widget)
michael@0: {
michael@0:   return GTK_COLOR_SELECTION(gtk_color_selection_dialog_get_color_selection(
michael@0:                              GTK_COLOR_SELECTION_DIALOG(widget)));
michael@0: }
michael@0: 
michael@0: /* void init (in nsIDOMWindow parent, in AString title, in short mode); */
michael@0: NS_IMETHODIMP nsColorPicker::Init(nsIDOMWindow *parent,
michael@0:                                   const nsAString& title,
michael@0:                                   const nsAString& initialColor)
michael@0: {
michael@0:   mParentWidget = mozilla::widget::WidgetUtils::DOMWindowToWidget(parent);
michael@0:   mTitle = title;
michael@0:   mInitialColor = initialColor;
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: /* void open (in nsIColorPickerShownCallback aColorPickerShownCallback); */
michael@0: NS_IMETHODIMP nsColorPicker::Open(nsIColorPickerShownCallback *aColorPickerShownCallback)
michael@0: {
michael@0: 
michael@0:   // Input color string should be 7 length (i.e. a string representing a valid
michael@0:   // simple color)
michael@0:   if (mInitialColor.Length() != 7) {
michael@0:     return NS_ERROR_FAILURE;
michael@0:   }
michael@0: 
michael@0:   const nsAString& withoutHash  = StringTail(mInitialColor, 6);
michael@0:   nscolor color;
michael@0:   if (!NS_HexToRGB(withoutHash, &color)) {
michael@0:     return NS_ERROR_FAILURE;
michael@0:   }
michael@0: 
michael@0:   GdkColor color_gdk = convertToGdkColor(color);
michael@0: 
michael@0:   if (mCallback) {
michael@0:     // It means Open has already been called: this is not allowed
michael@0:     NS_WARNING("mCallback is already set. Open called twice?");
michael@0:     return NS_ERROR_FAILURE;
michael@0:   }
michael@0:   mCallback = aColorPickerShownCallback;
michael@0: 
michael@0:   nsXPIDLCString title;
michael@0:   title.Adopt(ToNewUTF8String(mTitle));
michael@0:   GtkWidget *color_chooser = gtk_color_selection_dialog_new(title);
michael@0: 
michael@0:   GtkWindow *parent_window = GTK_WINDOW(mParentWidget->GetNativeData(NS_NATIVE_SHELLWIDGET));
michael@0:   if (parent_window) {
michael@0:     GtkWindow *window = GTK_WINDOW(color_chooser);
michael@0:     gtk_window_set_transient_for(window, parent_window);
michael@0:     gtk_window_set_destroy_with_parent(window, TRUE);
michael@0:   }
michael@0: 
michael@0:   gtk_color_selection_set_current_color(WidgetGetColorSelection(color_chooser),
michael@0:                                         &color_gdk);
michael@0: 
michael@0:   NS_ADDREF_THIS();
michael@0:   g_signal_connect(WidgetGetColorSelection(color_chooser), "color-changed",
michael@0:                    G_CALLBACK(OnColorChanged), this);
michael@0:   g_signal_connect(color_chooser, "response", G_CALLBACK(OnResponse), this);
michael@0:   g_signal_connect(color_chooser, "destroy", G_CALLBACK(OnDestroy), this);
michael@0:   gtk_widget_show(color_chooser);
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: /* static */ void
michael@0: nsColorPicker::OnColorChanged(GtkColorSelection* colorselection,
michael@0:                               gpointer user_data)
michael@0: {
michael@0:   static_cast<nsColorPicker*>(user_data)->Update(colorselection);
michael@0: }
michael@0: 
michael@0: /* static */ void
michael@0: nsColorPicker::OnResponse(GtkWidget* color_chooser, gint response_id,
michael@0:                           gpointer user_data)
michael@0: {
michael@0:   static_cast<nsColorPicker*>(user_data)->
michael@0:     Done(color_chooser, response_id);
michael@0: }
michael@0: 
michael@0: /* static */ void
michael@0: nsColorPicker::OnDestroy(GtkWidget* color_chooser, gpointer user_data)
michael@0: {
michael@0:   static_cast<nsColorPicker*>(user_data)->
michael@0:     Done(color_chooser, GTK_RESPONSE_CANCEL);
michael@0: }
michael@0: 
michael@0: void
michael@0: nsColorPicker::Update(GtkColorSelection* colorselection)
michael@0: {
michael@0:   ReadValueFromColorSelection(colorselection);
michael@0:   if (mCallback) {
michael@0:     mCallback->Update(mColor);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: nsColorPicker::Done(GtkWidget* color_chooser, gint response)
michael@0: {
michael@0:   switch (response) {
michael@0:     case GTK_RESPONSE_OK:
michael@0:     case GTK_RESPONSE_ACCEPT:
michael@0:       ReadValueFromColorSelection(WidgetGetColorSelection(color_chooser));
michael@0:       break;
michael@0:     case GTK_RESPONSE_CANCEL:
michael@0:     case GTK_RESPONSE_CLOSE:
michael@0:     case GTK_RESPONSE_DELETE_EVENT:
michael@0:       mColor = mInitialColor;
michael@0:       break;
michael@0:     default:
michael@0:       NS_WARNING("Unexpected response");
michael@0:       break;
michael@0:   }
michael@0: 
michael@0:   // A "response" signal won't be sent again but "destroy" will be.
michael@0:   g_signal_handlers_disconnect_by_func(color_chooser,
michael@0:                                        FuncToGpointer(OnDestroy), this);
michael@0: 
michael@0:   gtk_widget_destroy(color_chooser);
michael@0:   if (mCallback) {
michael@0:     mCallback->Done(mColor);
michael@0:     mCallback = nullptr;
michael@0:   }
michael@0: 
michael@0:   NS_RELEASE_THIS();
michael@0: }
michael@0: 
michael@0: nsString nsColorPicker::ToHexString(int n)
michael@0: {
michael@0:   nsString result;
michael@0:   if (n <= 0x0F) {
michael@0:     result.Append('0');
michael@0:   }
michael@0:   result.AppendInt(n, 16);
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: void nsColorPicker::ReadValueFromColorSelection(GtkColorSelection* colorselection)
michael@0: {
michael@0:   GdkColor rgba;
michael@0:   gtk_color_selection_get_current_color(colorselection, &rgba);
michael@0: 
michael@0:   mColor.AssignLiteral("#");
michael@0:   mColor += ToHexString(convertGdkColorComponent(rgba.red));
michael@0:   mColor += ToHexString(convertGdkColorComponent(rgba.green));
michael@0:   mColor += ToHexString(convertGdkColorComponent(rgba.blue));
michael@0: }