[tor-commits] [tor-browser/tor-browser-84.0b1-10.5-1] Bug 32220: Improve the letterboxing experience

gk at torproject.org gk at torproject.org
Wed Dec 2 13:47:07 UTC 2020


commit 5faba946058719491e2455b7970f8ef7977eed23
Author: Richard Pospesel <richard at torproject.org>
Date:   Mon Oct 28 17:42:17 2019 -0700

    Bug 32220: Improve the letterboxing experience
    
    CSS and JS changes to alter the UX surrounding letterboxing. The
    browser element containing page content is now anchored to the bottom
    of the toolbar, and the remaining letterbox margin is the same color
    as the firefox chrome. The letterbox margin and border are tied to
    the currently selected theme.
    
    Also adds a 'needsLetterbox' property to tabbrowser.xml to fix a race
    condition present when using the 'isEmpty' property. Using 'isEmpty'
    as a proxy for 'needsLetterbox' resulted in over-zealous/unnecessary
    letterboxing of about:blank tabs.
---
 browser/base/content/browser.css                   |  8 ++
 browser/base/content/tabbrowser-tab.js             |  9 +++
 browser/themes/shared/tabs.inc.css                 |  6 ++
 .../components/resistfingerprinting/RFPHelper.jsm  | 94 +++++++++++++++++++---
 4 files changed, 105 insertions(+), 12 deletions(-)

diff --git a/browser/base/content/browser.css b/browser/base/content/browser.css
index a649e7a41e46..1d483e20df53 100644
--- a/browser/base/content/browser.css
+++ b/browser/base/content/browser.css
@@ -85,6 +85,14 @@ body {
   display: none;
 }
 
+
+.browserStack > browser.letterboxing {
+  border-color: var(--chrome-content-separator-color);
+  border-style: solid;
+  border-width : 1px;
+  border-top: none;
+}
+
 %ifdef MENUBAR_CAN_AUTOHIDE
 #toolbar-menubar[autohide="true"] {
   overflow: hidden;
diff --git a/browser/base/content/tabbrowser-tab.js b/browser/base/content/tabbrowser-tab.js
index 2bc18e4d7320..10e678bb1950 100644
--- a/browser/base/content/tabbrowser-tab.js
+++ b/browser/base/content/tabbrowser-tab.js
@@ -225,6 +225,15 @@
       return true;
     }
 
+    get needsLetterbox() {
+      let browser = this.linkedBrowser;
+      if (isBlankPageURL(browser.currentURI.spec)) {
+        return false;
+      }
+
+      return true;
+    }
+
     get lastAccessed() {
       return this._lastAccessed == Infinity ? Date.now() : this._lastAccessed;
     }
diff --git a/browser/themes/shared/tabs.inc.css b/browser/themes/shared/tabs.inc.css
index 47697d24cfb3..8025dd34a43a 100644
--- a/browser/themes/shared/tabs.inc.css
+++ b/browser/themes/shared/tabs.inc.css
@@ -33,6 +33,12 @@
   background-color: #f9f9fa;
 }
 
+/* extend down the toolbar's colors when letterboxing is enabled*/
+#tabbrowser-tabpanels.letterboxing {
+  background-color: var(--toolbar-bgcolor);
+  background-image: var(--toolbar-bgimage);
+}
+
 :root[privatebrowsingmode=temporary] #tabbrowser-tabpanels {
   /* Value for --in-content-page-background in aboutPrivateBrowsing.css */
   background-color: #25003e;
diff --git a/toolkit/components/resistfingerprinting/RFPHelper.jsm b/toolkit/components/resistfingerprinting/RFPHelper.jsm
index 166ad21e9013..9520d8720631 100644
--- a/toolkit/components/resistfingerprinting/RFPHelper.jsm
+++ b/toolkit/components/resistfingerprinting/RFPHelper.jsm
@@ -40,6 +40,7 @@ class _RFPHelper {
   // ============================================================================
   constructor() {
     this._initialized = false;
+    this._borderDimensions = null;
   }
 
   init() {
@@ -361,6 +362,24 @@ class _RFPHelper {
     });
   }
 
+  getBorderDimensions(aBrowser) {
+    if (this._borderDimensions) {
+      return this._borderDimensions;
+    }
+
+    const win = aBrowser.ownerGlobal;
+    const browserStyle = win.getComputedStyle(aBrowser);
+
+    this._borderDimensions = {
+      top : parseInt(browserStyle.borderTopWidth),
+      right: parseInt(browserStyle.borderRightWidth),
+      bottom : parseInt(browserStyle.borderBottomWidth),
+      left : parseInt(browserStyle.borderLeftWidth),
+    };
+
+    return this._borderDimensions;
+  }
+
   _addOrClearContentMargin(aBrowser) {
     let tab = aBrowser.getTabBrowser().getTabForBrowser(aBrowser);
 
@@ -369,9 +388,13 @@ class _RFPHelper {
       return;
     }
 
+    // we add the letterboxing class even if the content does not need letterboxing
+    // in which case margins are set such that the borders are hidden
+    aBrowser.classList.add("letterboxing");
+
     // We should apply no margin around an empty tab or a tab with system
     // principal.
-    if (tab.isEmpty || aBrowser.contentPrincipal.isSystemPrincipal) {
+    if (!tab.needsLetterbox || aBrowser.contentPrincipal.isSystemPrincipal) {
       this._clearContentViewMargin(aBrowser);
     } else {
       this._roundContentView(aBrowser);
@@ -539,10 +562,29 @@ class _RFPHelper {
     // Calculating the margins around the browser element in order to round the
     // content viewport. We will use a 200x100 stepping if the dimension set
     // is not given.
-    let margins = calcMargins(containerWidth, containerHeight);
+
+    const borderDimensions = this.getBorderDimensions(aBrowser);
+    const marginDims = calcMargins(containerWidth, containerHeight - borderDimensions.top);
+
+    let margins = {
+      top : 0,
+      right : 0,
+      bottom : 0,
+      left : 0,
+    };
+
+    // snap browser element to top
+    margins.top = 0;
+    // and leave 'double' margin at the bottom
+    margins.bottom = 2 * marginDims.height - borderDimensions.bottom;
+    // identical margins left and right
+    margins.right = marginDims.width - borderDimensions.right;
+    margins.left = marginDims.width - borderDimensions.left;
+
+    const marginStyleString = `${margins.top}px ${margins.right}px ${margins.bottom}px ${margins.left}px`;
 
     // If the size of the content is already quantized, we do nothing.
-    if (aBrowser.style.margin == `${margins.height}px ${margins.width}px`) {
+    if (aBrowser.style.margin === marginStyleString) {
       log("_roundContentView[" + logId + "] is_rounded == true");
       if (this._isLetterboxingTesting) {
         log(
@@ -563,19 +605,35 @@ class _RFPHelper {
         "_roundContentView[" +
           logId +
           "] setting margins to " +
-          margins.width +
-          " x " +
-          margins.height
+          marginStyleString
       );
-      // One cannot (easily) control the color of a margin unfortunately.
-      // An initial attempt to use a border instead of a margin resulted
-      // in offset event dispatching; so for now we use a colorless margin.
-      aBrowser.style.margin = `${margins.height}px ${margins.width}px`;
+
+      // The margin background color is determined by the background color of the
+      // window's tabpanels#tabbrowser-tabpanels element
+      aBrowser.style.margin = marginStyleString;
     });
   }
 
   _clearContentViewMargin(aBrowser) {
+    const borderDimensions = this.getBorderDimensions(aBrowser);
+    // set the margins such that the browser elements border is visible up top, but
+    // are rendered off-screen on the remaining sides
+    let margins = {
+      top : 0,
+      right : -borderDimensions.right,
+      bottom : -borderDimensions.bottom,
+      left : -borderDimensions.left,
+    };
+    const marginStyleString = `${margins.top}px ${margins.right}px ${margins.bottom}px ${margins.left}px`;
+
+    aBrowser.ownerGlobal.requestAnimationFrame(() => {
+      aBrowser.style.margin = marginStyleString;
+    });
+  }
+
+  _removeLetterboxing(aBrowser) {
     aBrowser.ownerGlobal.requestAnimationFrame(() => {
+      aBrowser.classList.remove("letterboxing");
       aBrowser.style.margin = "";
     });
   }
@@ -593,6 +651,11 @@ class _RFPHelper {
     aWindow.gBrowser.addTabsProgressListener(this);
     aWindow.addEventListener("TabOpen", this);
 
+    const tabPanel = aWindow.document.getElementById("tabbrowser-tabpanels");
+    if (tabPanel) {
+      tabPanel.classList.add("letterboxing");
+    }
+
     // Rounding the content viewport.
     this._updateMarginsForTabsInWindow(aWindow);
   }
@@ -616,10 +679,17 @@ class _RFPHelper {
     tabBrowser.removeTabsProgressListener(this);
     aWindow.removeEventListener("TabOpen", this);
 
-    // Clear all margins and tooltip for all browsers.
+    // revert tabpanel's background colors to default
+    const tabPanel = aWindow.document.getElementById("tabbrowser-tabpanels");
+    if (tabPanel) {
+      tabPanel.classList.remove("letterboxing");
+    }
+
+    // and revert each browser element to default,
+    // restore default margins and remove letterboxing class
     for (let tab of tabBrowser.tabs) {
       let browser = tab.linkedBrowser;
-      this._clearContentViewMargin(browser);
+      this._removeLetterboxing(browser);
     }
   }
 





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