commit 5a8abdcce838d34f702f70df540904deae72d4b4 Author: Richard Pospesel richard@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 | 7 ++ browser/base/content/tabbrowser-tab.js | 9 +++ browser/themes/shared/tabs.inc.css | 6 ++ .../components/resistfingerprinting/RFPHelper.jsm | 94 +++++++++++++++++++--- 4 files changed, 104 insertions(+), 12 deletions(-)

diff --git a/browser/base/content/browser.css b/browser/base/content/browser.css index 4839b43335f7..f1c16ca6e827 100644 --- a/browser/base/content/browser.css +++ b/browser/base/content/browser.css @@ -94,6 +94,13 @@ body { } }

+.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 a8d225807a69..7126d0955582 100644 --- a/browser/base/content/tabbrowser-tab.js +++ b/browser/base/content/tabbrowser-tab.js @@ -229,6 +229,15 @@ 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 6e38fda8b98d..242b1ee0c0c8 100644 --- a/browser/themes/shared/tabs.inc.css +++ b/browser/themes/shared/tabs.inc.css @@ -53,6 +53,12 @@ background-color: var(--tabpanel-background-color); }

+/* extend down the toolbar's colors when letterboxing is enabled*/ +#tabbrowser-tabpanels.letterboxing { + background-color: var(--toolbar-bgcolor); + background-image: var(--toolbar-bgimage); +} + #tabbrowser-tabs, #tabbrowser-arrowscrollbox, #tabbrowser-tabs[positionpinnedtabs] > #tabbrowser-arrowscrollbox > .tabbrowser-tab[pinned] { 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); } }