1 files changed, 91 insertions, 0 deletions
diff --git a/webbrowser/base/content/browser-devtools-theme.js b/webbrowser/base/content/browser-devtools-theme.js
new file mode 100644
index 0000000..7b21dde
--- /dev/null
+++ b/webbrowser/base/content/browser-devtools-theme.js
@@ -0,0 +1,91 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Listeners for the DevTools theme.
+ */
+var DevToolsTheme = {
+  _devtoolsThemePrefName: "devtools.theme",
+  styleSheet: null,
+  initialized: false,
+
+  get isStyleSheetEnabled() {
+    return this.styleSheet && !this.styleSheet.sheet.disabled;
+  },
+
+  init: function () {
+    this.initialized = true;
+    Services.prefs.addObserver(this._devtoolsThemePrefName, this, false);
+    Services.obs.addObserver(this, "lightweight-theme-styling-update", false);
+    Services.obs.addObserver(this, "lightweight-theme-window-updated", false);
+    this._updateDevtoolsThemeAttribute();
+  },
+
+  observe: function (subject, topic, data) {
+    if (topic == "lightweight-theme-styling-update") {
+      let newTheme = JSON.parse(data);
+      this._toggleStyleSheet();
+    }
+
+    if (topic == "nsPref:changed" && data == this._devtoolsThemePrefName) {
+      this._updateDevtoolsThemeAttribute();
+    }
+  },
+
+  _inferBrightness: function() {
+    ToolbarIconColor.inferFromText();
+    // Get an inverted full screen button if the dark theme is applied.
+    if (this.isStyleSheetEnabled &&
+        document.documentElement.getAttribute("devtoolstheme") == "dark") {
+      document.documentElement.setAttribute("brighttitlebarforeground", "true");
+    } else {
+      document.documentElement.removeAttribute("brighttitlebarforeground");
+    }
+  },
+
+  _updateDevtoolsThemeAttribute: function() {
+    // Set an attribute on root element to make it possible
+    // to change colors based on the selected devtools theme.
+    let devtoolsTheme = Services.prefs.getCharPref(this._devtoolsThemePrefName);
+    if (devtoolsTheme != "dark") {
+      devtoolsTheme = "light";
+    }
+    document.documentElement.setAttribute("devtoolstheme", devtoolsTheme);
+    this._inferBrightness();
+  },
+
+  handleEvent: function(e) {
+    if (e.type === "load") {
+      this.styleSheet.removeEventListener("load", this);
+      this.refreshBrowserDisplay();
+    }
+  },
+
+  refreshBrowserDisplay: function() {
+    // Don't touch things on the browser if gBrowserInit.onLoad hasn't
+    // yet fired.
+    if (this.initialized) {
+      gBrowser.tabContainer._positionPinnedTabs();
+      this._inferBrightness();
+    }
+  },
+
+  _toggleStyleSheet: function() {
+    let wasEnabled = this.isStyleSheetEnabled;
+    if (wasEnabled) {
+      this.styleSheet.sheet.disabled = true;
+      this.refreshBrowserDisplay();
+    }
+  },
+
+  uninit: function () {
+    Services.prefs.removeObserver(this._devtoolsThemePrefName, this);
+    Services.obs.removeObserver(this, "lightweight-theme-styling-update", false);
+    Services.obs.removeObserver(this, "lightweight-theme-window-updated", false);
+    if (this.styleSheet) {
+      this.styleSheet.removeEventListener("load", this);
+    }
+    this.styleSheet = null;
+  }
+};