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Merge pull request #1844 from gnarf/delay-ctm

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Delay getting inverse screen CTM until needed
This commit is contained in:
Rachel Fenichel
2018-05-07 14:21:39 -07:00
committed by GitHub
parent 314221d832 222e33eaa3
commit cc33296f04
1 changed files with 20 additions and 5 deletions
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25
core/workspace_svg.js
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@@ -300,22 +300,37 @@ Blockly.WorkspaceSvg.prototype.targetWorkspace = null;
*/
Blockly.WorkspaceSvg.prototype.inverseScreenCTM_ = null;
/**
* Inverted screen CTM is dirty, recalculate it.
* @type {Boolean}
* @private
*/
Blockly.WorkspaceSvg.prototype.inverseScreenCTMDirty_ = true;
/**
* Getter for the inverted screen CTM.
* @return {SVGMatrix} The matrix to use in mouseToSvg
*/
Blockly.WorkspaceSvg.prototype.getInverseScreenCTM = function() {
// Defer getting the screen CTM until we actually need it, this should
// avoid forced reflows from any calls to updateInverseScreenCTM.
if (this.inverseScreenCTMDirty_) {
var ctm = this.getParentSvg().getScreenCTM();
if (ctm) {
this.inverseScreenCTM_ = ctm.inverse();
this.inverseScreenCTMDirty_ = false;
}
}
return this.inverseScreenCTM_;
};
/**
* Update the inverted screen CTM.
* Mark the inverse screen CTM as dirty.
*/
Blockly.WorkspaceSvg.prototype.updateInverseScreenCTM = function() {
var ctm = this.getParentSvg().getScreenCTM();
if (ctm) {
this.inverseScreenCTM_ = ctm.inverse();
}
this.inverseScreenCTMDirty_ = true;
};
/**