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| author | wolfbeast <mcwerewolf@gmail.com> | 2018-06-04 15:50:03 +0200 |
|---|---|---|
| committer | wolfbeast <mcwerewolf@gmail.com> | 2018-06-04 15:50:03 +0200 |
| commit | e3b7744bee37c3d4a026d2193bed5e9439c40ff3 (patch) | |
| tree | f3f7b07ca9bd78bf7ac2d76dd55b61b2a8bb549e /application/basilisk/components/customizableui/ScrollbarSampler.jsm | |
| parent | cbce4f0b6a337f8250b62cae028f1c6d4cce51df (diff) | |
| parent | 031afcafe288bf0f46c0c5caae20dd3db8bd0297 (diff) | |
| download | UXP-e3b7744bee37c3d4a026d2193bed5e9439c40ff3.tar UXP-e3b7744bee37c3d4a026d2193bed5e9439c40ff3.tar.gz UXP-e3b7744bee37c3d4a026d2193bed5e9439c40ff3.tar.lz UXP-e3b7744bee37c3d4a026d2193bed5e9439c40ff3.tar.xz UXP-e3b7744bee37c3d4a026d2193bed5e9439c40ff3.zip | |
Merge branch 'move-basilisk'
Diffstat (limited to 'application/basilisk/components/customizableui/ScrollbarSampler.jsm')
| -rw-r--r-- | application/basilisk/components/customizableui/ScrollbarSampler.jsm | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/application/basilisk/components/customizableui/ScrollbarSampler.jsm b/application/basilisk/components/customizableui/ScrollbarSampler.jsm new file mode 100644 index 000000000..44736e4c4 --- /dev/null +++ b/application/basilisk/components/customizableui/ScrollbarSampler.jsm @@ -0,0 +1,65 @@ +/* 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/. */ + +"use strict"; + +this.EXPORTED_SYMBOLS = ["ScrollbarSampler"]; + +const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components; + +Cu.import("resource://gre/modules/Services.jsm"); +Cu.import("resource://gre/modules/XPCOMUtils.jsm"); + +var gSystemScrollbarWidth = null; + +this.ScrollbarSampler = { + getSystemScrollbarWidth: function() { + if (gSystemScrollbarWidth !== null) { + return Promise.resolve(gSystemScrollbarWidth); + } + + return new Promise(resolve => { + this._sampleSystemScrollbarWidth().then(function(systemScrollbarWidth) { + gSystemScrollbarWidth = systemScrollbarWidth; + resolve(gSystemScrollbarWidth); + }); + }); + }, + + resetSystemScrollbarWidth: function() { + gSystemScrollbarWidth = null; + }, + + _sampleSystemScrollbarWidth: function() { + let hwin = Services.appShell.hiddenDOMWindow; + let hdoc = hwin.document.documentElement; + let iframe = hwin.document.createElementNS("http://www.w3.org/1999/xhtml", + "html:iframe"); + iframe.setAttribute("srcdoc", '<body style="overflow-y: scroll"></body>'); + hdoc.appendChild(iframe); + + let cwindow = iframe.contentWindow; + let utils = cwindow.QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDOMWindowUtils); + + return new Promise(resolve => { + cwindow.addEventListener("load", function onLoad(aEvent) { + cwindow.removeEventListener("load", onLoad); + let sbWidth = {}; + try { + utils.getScrollbarSize(true, sbWidth, {}); + } catch (e) { + Cu.reportError("Could not sample scrollbar size: " + e + " -- " + + e.stack); + sbWidth.value = 0; + } + // Minimum width of 10 so that we have enough padding: + sbWidth.value = Math.max(sbWidth.value, 10); + resolve(sbWidth.value); + iframe.remove(); + }); + }); + } +}; +Object.freeze(this.ScrollbarSampler); |