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196 lines
5.9 KiB
196 lines
5.9 KiB
exports._cleanNavigation = function() {
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// clean up previous navigation items
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var wrapper = document.getElementById('network-navigation_wrapper');
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if (wrapper != null) {
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this.containerElement.removeChild(wrapper);
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}
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document.onmouseup = null;
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};
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/**
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* Creation of the navigation controls nodes. They are drawn over the rest of the nodes and are not affected by scale and translation
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* they have a triggerFunction which is called on click. If the position of the navigation controls is dependent
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* on this.frame.canvas.clientWidth or this.frame.canvas.clientHeight, we flag horizontalAlignLeft and verticalAlignTop false.
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* This means that the location will be corrected by the _relocateNavigation function on a size change of the canvas.
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*
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* @private
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*/
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exports._loadNavigationElements = function() {
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this._cleanNavigation();
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this.navigationDivs = {};
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var navigationDivs = ['up','down','left','right','zoomIn','zoomOut','zoomExtends'];
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var navigationDivActions = ['_moveUp','_moveDown','_moveLeft','_moveRight','_zoomIn','_zoomOut','zoomExtent'];
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this.navigationDivs['wrapper'] = document.createElement('div');
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this.navigationDivs['wrapper'].id = "network-navigation_wrapper";
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this.navigationDivs['wrapper'].style.position = "absolute";
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this.navigationDivs['wrapper'].style.width = this.frame.canvas.clientWidth + "px";
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this.navigationDivs['wrapper'].style.height = this.frame.canvas.clientHeight + "px";
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this.containerElement.insertBefore(this.navigationDivs['wrapper'],this.frame);
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for (var i = 0; i < navigationDivs.length; i++) {
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this.navigationDivs[navigationDivs[i]] = document.createElement('div');
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this.navigationDivs[navigationDivs[i]].id = "network-navigation_" + navigationDivs[i];
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this.navigationDivs[navigationDivs[i]].className = "network-navigation " + navigationDivs[i];
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this.navigationDivs['wrapper'].appendChild(this.navigationDivs[navigationDivs[i]]);
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this.navigationDivs[navigationDivs[i]].onmousedown = this[navigationDivActions[i]].bind(this);
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}
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document.onmouseup = this._stopMovement.bind(this);
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};
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/**
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* this stops all movement induced by the navigation buttons
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*
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* @private
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*/
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exports._stopMovement = function() {
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this._xStopMoving();
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this._yStopMoving();
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this._stopZoom();
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};
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/**
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* stops the actions performed by page up and down etc.
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*
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* @param event
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* @private
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*/
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exports._preventDefault = function(event) {
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if (event !== undefined) {
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if (event.preventDefault) {
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event.preventDefault();
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} else {
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event.returnValue = false;
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}
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}
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};
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/**
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* move the screen up
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* By using the increments, instead of adding a fixed number to the translation, we keep fluent and
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* instant movement. The onKeypress event triggers immediately, then pauses, then triggers frequently
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* To avoid this behaviour, we do the translation in the start loop.
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*
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* @private
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*/
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exports._moveUp = function(event) {
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this.yIncrement = this.constants.keyboard.speed.y;
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this.start(); // if there is no node movement, the calculation wont be done
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this._preventDefault(event);
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if (this.navigationDivs) {
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this.navigationDivs['up'].className += " active";
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}
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};
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/**
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* move the screen down
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* @private
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*/
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exports._moveDown = function(event) {
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this.yIncrement = -this.constants.keyboard.speed.y;
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this.start(); // if there is no node movement, the calculation wont be done
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this._preventDefault(event);
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if (this.navigationDivs) {
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this.navigationDivs['down'].className += " active";
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}
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};
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/**
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* move the screen left
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* @private
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*/
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exports._moveLeft = function(event) {
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this.xIncrement = this.constants.keyboard.speed.x;
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this.start(); // if there is no node movement, the calculation wont be done
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this._preventDefault(event);
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if (this.navigationDivs) {
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this.navigationDivs['left'].className += " active";
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}
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};
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/**
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* move the screen right
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* @private
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*/
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exports._moveRight = function(event) {
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this.xIncrement = -this.constants.keyboard.speed.y;
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this.start(); // if there is no node movement, the calculation wont be done
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this._preventDefault(event);
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if (this.navigationDivs) {
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this.navigationDivs['right'].className += " active";
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}
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};
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/**
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* Zoom in, using the same method as the movement.
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* @private
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*/
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exports._zoomIn = function(event) {
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this.zoomIncrement = this.constants.keyboard.speed.zoom;
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this.start(); // if there is no node movement, the calculation wont be done
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this._preventDefault(event);
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if (this.navigationDivs) {
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this.navigationDivs['zoomIn'].className += " active";
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}
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};
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/**
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* Zoom out
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* @private
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*/
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exports._zoomOut = function() {
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this.zoomIncrement = -this.constants.keyboard.speed.zoom;
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this.start(); // if there is no node movement, the calculation wont be done
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this._preventDefault(event);
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if (this.navigationDivs) {
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this.navigationDivs['zoomOut'].className += " active";
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}
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};
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/**
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* Stop zooming and unhighlight the zoom controls
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* @private
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*/
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exports._stopZoom = function() {
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this.zoomIncrement = 0;
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if (this.navigationDivs) {
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this.navigationDivs['zoomIn'].className = this.navigationDivs['zoomIn'].className.replace(" active","");
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this.navigationDivs['zoomOut'].className = this.navigationDivs['zoomOut'].className.replace(" active","");
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}
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};
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/**
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* Stop moving in the Y direction and unHighlight the up and down
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* @private
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*/
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exports._yStopMoving = function() {
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this.yIncrement = 0;
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if (this.navigationDivs) {
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this.navigationDivs['up'].className = this.navigationDivs['up'].className.replace(" active","");
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this.navigationDivs['down'].className = this.navigationDivs['down'].className.replace(" active","");
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}
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};
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/**
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* Stop moving in the X direction and unHighlight left and right.
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* @private
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*/
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exports._xStopMoving = function() {
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this.xIncrement = 0;
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if (this.navigationDivs) {
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this.navigationDivs['left'].className = this.navigationDivs['left'].className.replace(" active","");
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this.navigationDivs['right'].className = this.navigationDivs['right'].className.replace(" active","");
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}
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};
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