150 lines
4.5 KiB
JavaScript
150 lines
4.5 KiB
JavaScript
/*
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* @provide pskl.drawingtools.BaseSelect
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*
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* @require pskl.utils
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*/
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(function() {
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var ns = $.namespace("pskl.drawingtools");
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ns.BaseSelect = function() {
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this.secondaryToolId = "tool-move";
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this.BodyRoot = $('body');
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// Select's first point coordinates (set in applyToolAt)
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this.startCol = null;
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this.startRow = null;
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};
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pskl.utils.inherit(ns.BaseSelect, ns.BaseTool);
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/**
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* @override
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*/
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ns.BaseSelect.prototype.applyToolAt = function(col, row, color, frame, overlay) {
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this.startCol = col;
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this.startRow = row;
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this.lastCol = col;
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this.lastRow = row;
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// The select tool can be in two different state.
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// If the inital click of the tool is not on a selection, we go in "select"
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// mode to create a selection.
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// If the initial click is on a previous selection, we go in "moveSelection"
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// mode to allow to move the selection by drag'n dropping it.
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if(overlay.getPixel(col, row) != Constants.SELECTION_TRANSPARENT_COLOR) {
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this.mode = "select";
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this.onSelectStart_(col, row, color, frame, overlay);
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}
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else {
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this.mode = "moveSelection";
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this.onSelectionDragStart_(col, row, color, frame, overlay);
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}
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};
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/**
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* @override
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*/
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ns.BaseSelect.prototype.moveToolAt = function(col, row, color, frame, overlay) {
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if(this.mode == "select") {
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this.onSelect_(col, row, color, frame, overlay);
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}
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else if(this.mode == "moveSelection") {
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this.onSelectionDrag_(col, row, color, frame, overlay);
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}
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};
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/**
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* @override
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*/
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ns.BaseSelect.prototype.releaseToolAt = function(col, row, color, frame, overlay) {
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if(this.mode == "select") {
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this.onSelectEnd_(col, row, color, frame, overlay);
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} else if(this.mode == "moveSelection") {
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this.onSelectionDragEnd_(col, row, color, frame, overlay);
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}
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};
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/**
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* If we mouseover the selection draw inside the overlay frame, show the 'move' cursor
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* instead of the 'select' one. It indicates that we can move the selection by dragndroping it.
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* @override
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*/
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ns.BaseSelect.prototype.moveUnactiveToolAt = function(col, row, color, frame, overlay) {
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if(overlay.getPixel(col, row) != Constants.SELECTION_TRANSPARENT_COLOR) {
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// We're hovering the selection, show the move tool:
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this.BodyRoot.addClass(this.toolId);
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this.BodyRoot.removeClass(this.secondaryToolId);
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} else {
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// We're not hovering the selection, show create selection tool:
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this.BodyRoot.addClass(this.secondaryToolId);
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this.BodyRoot.removeClass(this.toolId);
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}
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};
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/**
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* Move the overlay frame filled with semi-transparent pixels that represent the selection.
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* @private
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*/
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ns.BaseSelect.prototype.shiftOverlayFrame_ = function (colDiff, rowDiff, overlayFrame, reference) {
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var color;
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for (var col = 0 ; col < overlayFrame.getWidth() ; col++) {
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for (var row = 0 ; row < overlayFrame.getHeight() ; row++) {
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if (reference.containsPixel(col - colDiff, row - rowDiff)) {
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color = reference.getPixel(col - colDiff, row - rowDiff);
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} else {
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color = Constants.TRANSPARENT_COLOR;
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}
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overlayFrame.setPixel(col, row, color);
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}
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}
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};
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// The list of callbacks to implement by specialized tools to implement the selection creation behavior.
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/** @protected */
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ns.BaseSelect.prototype.onSelectStart_ = function (col, row, color, frame, overlay) {};
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/** @protected */
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ns.BaseSelect.prototype.onSelect_ = function (col, row, color, frame, overlay) {};
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/** @protected */
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ns.BaseSelect.prototype.onSelectEnd_ = function (col, row, color, frame, overlay) {};
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// The list of callbacks that define the drag'n drop behavior of the selection.
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/** @private */
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ns.BaseSelect.prototype.onSelectionDragStart_ = function (col, row, color, frame, overlay) {
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// Since we will move the overlayFrame in which the current selection is rendered,
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// we clone it to have a reference for the later shifting process.
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this.overlayFrameReference = overlay.clone();
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};
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/** @private */
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ns.BaseSelect.prototype.onSelectionDrag_ = function (col, row, color, frame, overlay) {
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var deltaCol = col - this.lastCol;
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var deltaRow = row - this.lastRow;
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var colDiff = col - this.startCol, rowDiff = row - this.startRow;
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// Shifting selection on overlay frame:
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this.shiftOverlayFrame_(colDiff, rowDiff, overlay, this.overlayFrameReference);
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// Update selection model:
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$.publish(Events.SELECTION_MOVE_REQUEST, [deltaCol, deltaRow]);
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this.lastCol = col;
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this.lastRow = row;
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};
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/** @private */
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ns.BaseSelect.prototype.onSelectionDragEnd_ = function (col, row, color, frame, overlay) {
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this.onSelectionDrag_(col, row, color, frame, overlay);
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};
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})();
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