ginebra/chrome/js/ActionButton.js
author William Roberts <williamr@symbian.org>
Fri, 11 Jun 2010 16:23:26 +0100
branchGCC_SURGE
changeset 2 bf4420e9fa4d
parent 0 1450b09d0cfd
permissions -rw-r--r--
Branch for GCC_SURGE fixes
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// Call ActionButton to wire an HTML button (typically an <img> tag) to an action (QAction).
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// Params:
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//   id - the id of the button.  Ex:  <img id="buttonId" .../>
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//   upImg - the path to the "up" image for the button.
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//   downImg - the path to the "down" image for the button.  Note: not yet working...
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//   disabledImg - the path to the "disabled" image for the button.
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//   action - the targeted action
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//
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function ActionButton(id, upImg, downImg, disabledImg, action) {
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    this.id = id;
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    this.upImg = upImg;
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    this.downImg = downImg;
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    this.disabledImg = disabledImg;
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    this.action = action;
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    this.isDown = false;
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    //window.chrome.alert("ActionButton");
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    // attach this object to the item as "button" for later access
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    // delete/cleanup existing button (if any) and attach this as button
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    dom = document.getElementById(this.id);
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    if(dom.button) {
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        delete dom.button;
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    }
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    dom.button = this;
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    this.element = function() {
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        return document.getElementById(this.id);
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    }
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    this.updateButton = function() {
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        //window.chrome.alert("ActionButton::updateButton " + this);
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        if(this.action.enabled) {
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            if(this.isDown) {
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                this.element().src = this.downImg;
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            }
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            else {
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                this.element().src = this.upImg;
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            }
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        }
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        else {
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            this.element().src = this.disabledImg;
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        }
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    }
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    // Make sure we can find the element.
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    if(!this.element()) {
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        alert("ActionButton: element not found, " + id);
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        return;
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    }
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    // --------------------------------
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    // Callback for changes in the action's state.
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    onActionChanged = function() {
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//          window.chrome.alert("ActionButton::on action changed " +
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//                              " this=" + this +
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//                              " action=" + this.action     +
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//                              " id=" + this.id     +
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//                              " enabled=" + this.action.enabled +
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//                              " src=" + this.element().src);
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        this.updateButton();
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    }
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// Commented out because onclick is not reliable.  Slight movements between mouse down
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// and mouse up seem to cancel the onclick.
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//    this.onClick = function() {
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//        window.chrome.alert("ActionButton::onClick: " + this);
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//        if(this.action.enabled) {
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//            this.action.trigger();
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//        }
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//        else {
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//            window.chrome.alert("ActionButton::onClick: not enabled");
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//        }
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//    }
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    this.onMouseDown = function() {
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        //window.chrome.alert("ActionButton::onMouseDown " + this);
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        if(!this.isDown) {
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        this.isDown = true;
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        this.updateButton.call(this);
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      if((this.id == 'zoomBarBtnIn') || (this.id == 'zoomBarBtnOut') || (this.id == 'zoomIn') || (this.id == 'zoomOut'))
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    	    this.action.trigger();
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        }
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    }
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    this.onMouseUp = function() {
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        //window.chrome.alert("ActionButton::onMouseUp " + this);
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        if(this.isDown) {
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        this.isDown = false;
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        this.updateButton.call(this);
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        // Trigger the action.
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        this.action.trigger();
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    }
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    }
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    this.onMouseOut = function() {
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        //window.chrome.alert("ActionButton::onMouseOut " + this);
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        if (this.isDown ) {
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            this.isDown = false;
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            this.updateButton.call(this);
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        if((this.id == 'zoomBarBtnIn') || (this.id == 'zoomBarBtnOut') || (this.id == 'zoomIn') || (this.id == 'zoomOut'))
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            this.action.trigger();
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        }
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    }
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    // Connect to the action's "changed" signal.  Note: don't use bind here, causes crash in
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    // scope chain code (but only for first document that is loaded...).
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    this.action.changed.connect(createDelegate(this, onActionChanged));
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    // Set up element event handlers.
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    this.element().onmousedown = this.onMouseDown.bind(this);
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    this.element().onmouseup = this.onMouseUp.bind(this);
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    this.element().onmouseout = this.onMouseOut.bind(this);
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//    this.element().onclick = this.onClick.bind(this);
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    // Set the initial state of the button.
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    this.updateButton();
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}
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   123