60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
/**
|
|
* Handles user input events and modifies state.
|
|
* Core logic comes through this class.
|
|
*/
|
|
goog.provide('ascii.Controller');
|
|
|
|
goog.require('ascii.Position');
|
|
goog.require('ascii.View');
|
|
|
|
/**
|
|
* @constructor
|
|
*/
|
|
ascii.Controller = function(view) {
|
|
/** type {ascii.View} */
|
|
this.view = view;
|
|
/** type {ascii.Position} */
|
|
this.clickPosition;
|
|
|
|
this.installDesktopBindings();
|
|
};
|
|
|
|
ascii.Controller.prototype.handlePress = function(x, y) {
|
|
this.clickPosition = new ascii.Position(x, y);
|
|
};
|
|
|
|
ascii.Controller.prototype.handleMove = function(x, y) {
|
|
if (this.clickPosition) {
|
|
// Drag has started.
|
|
this.view.offset.x -= (x - this.clickPosition.x)/this.view.zoom;
|
|
this.view.offset.y -= (y - this.clickPosition.y)/this.view.zoom;
|
|
this.clickPosition = new ascii.Position(x, y);
|
|
}
|
|
};
|
|
|
|
ascii.Controller.prototype.handleRelease = function(x, y) {
|
|
this.clickPosition = null;
|
|
};
|
|
|
|
ascii.Controller.prototype.handleZoom = function(delta) {
|
|
this.view.zoom *= delta > 0 ? 1.1 : 0.9;
|
|
this.view.zoom = Math.max(Math.min(this.view.zoom, 5), 0.2);
|
|
};
|
|
|
|
|
|
ascii.Controller.prototype.installDesktopBindings = function() {
|
|
var controller = this;
|
|
$(this.view.canvas).bind('mousewheel', function(e) {
|
|
controller.handleZoom(e.originalEvent.wheelDelta);
|
|
});
|
|
$(this.view.canvas).mousedown(function(e) {
|
|
controller.handlePress(e.clientX, e.clientY);
|
|
});
|
|
$(this.view.canvas).mouseup(function(e) {
|
|
controller.handleRelease(e.clientX, e.clientY);
|
|
});
|
|
$(this.view.canvas).mousemove(function(e) {
|
|
controller.handleMove(e.clientX, e.clientY);
|
|
});
|
|
};
|