piskel/js/drawingtools/selectiontools/BaseSelect.js

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