path: root/js/components/gradientpicker.reel/gradientpicker.js

/* <copyright>
Copyright (c) 2012, Motorola Mobility, Inc
All Rights Reserved.
BSD License.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

  - Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.
  - Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
  - Neither the name of Motorola Mobility nor the names of its contributors
    may be used to endorse or promote products derived from this software
    without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
</copyright> */

////////////////////////////////////////////////////////////////////////
//
var Montage = 	require("montage/core/core").Montage,
	Component = require("montage/ui/component").Component;
////////////////////////////////////////////////////////////////////////
//Exporting as ColorWheel
exports.GradientPicker = Montage.create(Component, {
	////////////////////////////////////////////////////////////////////
	//
	hasTemplate: {
        value: true
    },
    ////////////////////////////////////////////////////////////////////
    //
    _updating: {
        value: false
    },
    ////////////////////////////////////////////////////////////////////
    //
    _value: {
        value: null
    },
	////////////////////////////////////////////////////////////////////
    //
    value: {
        get: function() {return this._value;},
        set: function(value) {this._value = value;}
    },
    ////////////////////////////////////////////////////////////////////
    //
    _mode: {
        value: 'linear'
    },
	////////////////////////////////////////////////////////////////////
    //
    mode: {
        get: function() {return this._mode;},
        set: function(value) {
        	//
        	this.application.ninja.colorController.colorPopupManager.hideGradientChipPopup();
        	//
            this._mode = value;
            //
            this._dispatchEvent('change', false);
        }
    },
    ////////////////////////////////////////////////////////////////////
    //
    _trackData: {
	    value: {width: 0, x: 0, y: 0}
    },
    ////////////////////////////////////////////////////////////////////
    //
    prepareForDraw: {
    	value: function() {
    		//
		}
    },
    ////////////////////////////////////////////////////////////////////
    //
    willDraw: {
    	value: function() {
    		//Getting component views from layout
    		this._trackData.width = parseInt(getComputedStyle(this.trackChips).getPropertyCSSValue('width').cssText);
    		//TODO: Fix events and remove this hack
    		this.trackCover.addEventListener('mouseover', function () {
				if (!this._updating) {    		
	    			this.trackCover.style.display = 'none';
    			}
    		}.bind(this), true);
    		//
    		this.radioLinear.addEventListener('change', function (e){
    			this.mode = 'linear';
    		}.bind(this), true);
    		//
    		this.radioRadial.addEventListener('change', function (e){
    			this.mode = 'radial';
    		}.bind(this), true);	
		}
    },
    ////////////////////////////////////////////////////////////////////
    //
    draw: {
    	value: function() {
    		//Checking for mode to assign radio value
    		if (this.mode === 'linear') {
    			this.radioLinear.checked = 'true';
    		} else if (this.mode === 'radial') {
    			this.radioRadial.checked = 'true';
    		}
    		//Checkign for value to initialize stops
    		if (!this.value) {
    			this.addDefaultStops();
			} else {
				//Adding stops from preset value
				for (var i=0, stops = this.value; stops[i]; i++) {
					this.addStop({color: {mode: stops[i].mode, value: stops[i].value}, percent:stops[i].position}, true);
				}
			}
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
   	didDraw: {
    	value: function() {
			//Adding event listener for stops
			this.trackMain.addEventListener('click', this, false);
    		//Getting position of track
    		var point = webkitConvertPointFromNodeToPage(this.trackMain, new WebKitPoint(0, 0));
    		//Setting position of track to calculate movement
    		this._trackData.x = point.x;
    		this._trackData.y = point.y;	
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //Default stops funtion (reset)
    addDefaultStops: {
    	value: function() {
    		this.addStop({color: {mode: 'rgb', value: {r: 255, g: 255, b: 255, a: 1, css: 'rgb(255, 255, 255)'}}, percent: 0}, true);
			this.addStop({color: {mode: 'rgb', value: {r: 0, g: 0, b: 0, a: 1, css: 'rgb(0, 0, 0)'}}, percent: 100}, true);
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
   	addStop: {
    	value: function(data, silent) {
    		if (this.application.ninja.colorController.colorPopupManager) {
    			//Hiding any open popups (of gradient buttons)
    			this.application.ninja.colorController.colorPopupManager.hideGradientChipPopup();
    			//Creating stop elements
    			var stop = document.createElement('div'),
    				holder = document.createElement('div'),
					tooltip = document.createElement('span'),
					button = document.createElement('button');
				//Setting up elements
				stop.appendChild(tooltip);
				stop.appendChild(holder);
				holder.appendChild(button);
				//Adding events to the stops
				stop.addEventListener('mousedown', this, false);
				stop.addEventListener('mouseup', this, false);
				//Storing refereces to buttons and actual stop container
				button.stop = stop;
				tooltip.stop = stop;
				holder.stop = stop;
				stop.button = button;
				//Adding stop to container
				this.trackChips.appendChild(stop);
				//Checking for bounds to add stop
				if (data.percent >= 0 && data.percent <= 100) {
					this.positionStop(stop, data.percent);
					button.stopPosition = data.percent;
				}
				//Creating an instance of input chip
				this.application.ninja.colorController.addButton('chip', button);
				//Initialing button with color data
				button.color(data.color.mode, data.color.value);
				//Button popup data
				button.props = {side: 'top', align: 'center', nocolor: false, wheel: true, palette: false, gradient: false, image: false, offset: -84, gradientPopup: true, history: false};
				//Listening for color events from button
				button.addEventListener('change', this, false);
				//Dispatching event depending on type of mode
				if (!silent) {
					this._dispatchEvent('change', false);
				} else {
					this._dispatchEvent('change', true);
				}
				//
    		} else {
    				//Handle Error
    		}
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
    removeStop: {
    	value: function(stop) {
    		var i, buttons = this.trackChips.getElementsByTagName('button');
    		//
    		if (buttons.length > 2) {
    			//Removing stops
    			this.trackChips.removeChild(stop);
    			//Stopping events related to this current stop
    			this.removeStopMoving();
    		}
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
    removeStopMoving: {
    	value: function() {
    		this._updating = false;
    		this.trackCover.style.display = 'none';
			this._dispatchEvent('change', false);
			document.removeEventListener('mousemove', this, false);
			document.removeEventListener('mouseup', this, false);
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
    positionStop: {
    	value: function(stop, percent) {
    		try {
    			if (percent<0) {
	    			percent = 0;
	    		} else if (percent>100) {
	    			percent = 100;
	    		}
	    		//
    			var adj = (parseInt(getComputedStyle(stop).getPropertyCSSValue('width').cssText)*percent/100)/this._trackData.width;
    			stop.style.left = Math.round(percent-Math.round(adj*100))+'%';
    			stop.button.stopPosition = percent;
    		} catch (e) {
    			//TEMP
    		}
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //TODO: Add color detection canvas to get actual color
    handleClick: {
    	value: function(e) {
    		//Logic to get color from canvas data would go here
    		var data = {};
    		data.mode = 'rgb';
    		data.value = {r: 100, g: 100, b: 100, a: 1, css: 'rgb(100, 100, 100)'};
    		//
    		this.addStop({color: data, percent: Math.round(100*(e._event.offsetX/e._event.target.offsetWidth))});
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
    handleMouseup: {
    	value: function(e) {
			this.removeStopMoving();
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
    handleMousedown: {
    	value: function(e) {
			//
			var i, buttons = this.trackChips.getElementsByTagName('button');
			this.currentStop = e._event.target.stop;
    		//Looping through other stops to swap depths
    		for (i=0; buttons[i]; i++) {
    			buttons[i].stop.style.zIndex = 1;
    		}
			//Setting the depth of the current button to the highest
			this.currentStop.style.zIndex = buttons.length+1;
			//Adding events for actions while moving
			document.addEventListener('mousemove', this, false);
			document.addEventListener('mouseup', this, false);
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
    handleMousemove: {
    	value: function(e) {
    		//
    		this._updating = true;
    		//
    		this.application.ninja.colorController.colorPopupManager.hideGradientChipPopup();
    		//
    		if (e._event.y > this._trackData.y+70 || e._event.y < this._trackData.y) {
    			this.removeStop(this.currentStop);
    		}
    		//
    		if (this.currentStop.button.stopPosition !== Math.round((e._event.x-this._trackData.x)/this._trackData.width*100)) {
    			this.trackCover.style.display = 'block';
    		}
    		//
    		this.positionStop(this.currentStop, Math.round((e._event.x-this._trackData.x)/this._trackData.width*100));
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //
    handleChange: {
    	value: function(e) {
    		this.application.ninja.colorController.colorView.colorManager.input = this.application.ninja.colorController.colorView.previousInput;
			this._dispatchEvent('change', false);
			this.application.ninja.colorController.colorView.colorManager.input = 'chip';
    	}
    },
    ////////////////////////////////////////////////////////////////////
    //Dispatching custom event
    _dispatchEvent: {
        value: function(type, userInitiated) {
        	//
        	var actionEvent = document.createEvent("CustomEvent"), buttons = this.trackChips.getElementsByTagName('button'), stops = [], css, previewCss = '-webkit-gradient(linear, left top, right top';
        	//Preventing an events of less than 2 stops since there'll be a reset
        	if (buttons.length < 2) {
        		return;
        	}
        	//Initializing CSS string
        	if (this.mode === 'radial') {
        		css = '-webkit-radial-gradient(center, ellipse cover';
        	} else {
        		css = '-webkit-gradient(linear, left top, right top';
        	}
        	//Creating stops array
        	for (var i=0; i < buttons.length; i++) {
        		stops.push({value: buttons[i].colorValue, mode: buttons[i].colorMode, position: buttons[i].stopPosition});
        	}
        	//Sorting array (must be sorted for radial gradients, at least in Chrome
        	stops.sort(function(a,b){return a.position - b.position});
        	//Looping through stops in gradient to create CSS (actual and preview)
        	for (var i=0; i < stops.length; i++) {
        		//Addint to CSS String
        		if (this.mode === 'radial' && stops[i].value) {
        			css += ', '+stops[i].value.css+' '+stops[i].position+'% ';
        			//The CSS string for the preview bar is always linear
	        		previewCss += ', color-stop('+stops[i].position+'%,'+stops[i].value.css+')';
        		} else if (stops[i].value){
	        		css += ', color-stop('+stops[i].position+'%,'+stops[i].value.css+')';
	        		//The CSS string for the preview bar is always linear
	        		previewCss += ', color-stop('+stops[i].position+'%,'+stops[i].value.css+')';
        		} else {
        			//
        		}
        	}
        	//Closing the CSS strings
        	css += ')';
        	previewCss += ')';
        	//console.log(previewCss);
        	//Setting the preview track background
        	this.trackMain.style.background = previewCss;
        	//Storing the stops
        	this.value = stops;
        	//Initializing and storing data for event
            actionEvent.initEvent(type, true, true);
            actionEvent.type = type;
            actionEvent.wasSetByCode = userInitiated;
            actionEvent.gradient = {stops: this.value, mode: this.mode, gradientMode: this.mode, css: css};
            this.dispatchEvent(actionEvent);
        }
    }
    ////////////////////////////////////////////////////////////////////
});