helpers.js

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//  ***** BEGIN LICENSE BLOCK *****
// Version: MPL 1.1
// 
// The contents of this file are subject to the Mozilla Public License  
// Version
// 1.1 (the "License"); you may not use this file except in compliance  
// with
// the License. You may obtain a copy of the License at
// http://www.mozilla.org/MPL/
// 
// Software distributed under the License is distributed on an "AS IS"  
// basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied. See the  
// License
// for the specific language governing rights and limitations under the
// License.
// 
// The Original Code is Bespin.
// 
// The Initial Developer of the Original Code is Mozilla.
// Portions created by the Initial Developer are Copyright (C) 2009
// the Initial Developer. All Rights Reserved.
// 
// Contributor(s):
// 
// ***** END LICENSE BLOCK *****
//  

dojo.provide("th.helpers");

dojo.mixin(th.helpers, {
    isPercentage: function(str){  // TODO: make more robust 
        return (str.indexOf && str.indexOf("%") != -1);
    }
});

dojo.declare("th.helpers.EventHelpers", null, { 
    // only works on a Scene at the moment as it uses  
    wrapEvent: function(e, root) {
        // compute the canvas-local coordinates
        var coords = dojo.coords(this.canvas, true);
        var x = e.clientX - coords.l;
        var y = e.clientY - coords.t;
        
        var component = root.getComponentForPosition(x, y, true);
        e.thComponent = component;

        this.addComponentXY(e, root, component);
    },
    
    // changes clientX and clientY from space of source to space of dest; no change wraught if dest incompatible with source
    addComponentXY: function(e, source, dest) {
        if (!dest.bounds) {
            console.log("No dest bounds - " + dest.declaredClass);
            console.log(dest.bounds);
            console.log(dest);
            return;
        }

        // compute the canvas-local coordinates
        var coords = dojo.coords(this.canvas, true);
        var x = e.clientX - coords.l;
        var y = e.clientY - coords.t;
   
        var nxy = { x: x, y: y };

        var c = dest;
        while (c) {
            nxy.x -= c.bounds.x;
            nxy.y -= c.bounds.y;
            c = c.parent;

            if (c == source) {
                e.componentX = nxy.x;
                e.componentY = nxy.y;
                return;
            }
        }
    }
}); 
  
dojo.declare("th.helpers.ComponentHelpers", null, {  	
    // returns hash with some handy short-cuts for painting
    d: function() {  
        return {
           b: (this.bounds) ? { x: this.bounds.x, y: this.bounds.y, w: this.bounds.width, h: this.bounds.height,
                                iw: this.bounds.width - this.getInsets().left - this.getInsets().right,
                                ih: this.bounds.height - this.getInsets().top - this.getInsets().bottom } : {},
           i: { l: this.getInsets().left, r: this.getInsets().right, t: this.getInsets().top, b: this.getInsets().bottom,
                w: this.getInsets().left + this.getInsets().right, h: this.getInsets().top + this.getInsets().bottom }
        }
    },

    shouldPaint: function() {
        return (this.shouldLayout() && this.style.visibility != "hidden");
    },

    shouldLayout: function() {
        return (this.style.display != "none");
    },

    emptyInsets: function() {
        return { left: 0, right: 0, bottom: 0, top: 0 };
    }
}); 

dojo.declare("th.helpers.ContainerHelpers", null, {
    getScene: function() {
        var container = this;
        while (!container.scene && container.parent) container = container.parent;
        return container.scene;
    },

    getChildById: function(id) {
        for (var i = 0; i < this.children.length; i++) {
            if (this.children[i].id == id) return this.children[i];
        }
    },

    getComponentForPosition: function(x, y, recurse) {
        for (var i = 0; i < this.children.length; i++) {
            if (!this.children[i].bounds) continue;
            
            if (this.children[i].bounds.x <= x && this.children[i].bounds.y <= y
                    && (this.children[i].bounds.x + this.children[i].bounds.width) >= x
                    && (this.children[i].bounds.y + this.children[i].bounds.height) >= y) {
                if (!recurse) return this.children[i];
                return (this.children[i].getComponentForPosition) ?
                       this.children[i].getComponentForPosition(x - this.children[i].bounds.x, y - this.children[i].bounds.y, recurse) :
                       this.children[i];
            }
        }
        return this;
    },

    removeAll: function() {
        this.remove(this.children);
    }
});