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Delay getting inverse screen CTM until needed

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This commit is contained in:
Corey Frang
2018-05-04 13:22:57 -04:00
parent c1922a1cd2
commit 0dc32091c4
2 changed files with 22 additions and 6 deletions
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6
core/constants.js
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@@ -272,3 +272,9 @@ Blockly.RENAME_VARIABLE_ID = 'RENAME_VARIABLE_ID';
* @const {string}
*/
Blockly.DELETE_VARIABLE_ID = 'DELETE_VARIABLE_ID';
/**
* A constant value that we can use to mark calculated properties as dirty.
* @const {string}
*/
Blockly.DIRTY = 'dirty';

22
core/workspace_svg.js
View File

@@ -298,24 +298,34 @@ Blockly.WorkspaceSvg.prototype.targetWorkspace = null;
* @type {SVGMatrix}
* @private
*/
Blockly.WorkspaceSvg.prototype.inverseScreenCTM_ = null;
Blockly.WorkspaceSvg.prototype.inverseScreenCTM_ = Blockly.DIRTY;
/**
* 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.inverseScreenCTM_ == Blockly.DIRTY) {
var ctm = this.getParentSvg().getScreenCTM();
if (ctm) {
this.inverseScreenCTM_ = ctm.inverse();
} else {
// When dirty, and we can't get a CTM, set it to null.
this.inverseScreenCTM_ = null;
}
}
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.inverseScreenCTM_ = Blockly.DIRTY;
};
/**