+
+(function($) {
+ $.widget('wl.pictureviewer', {
+
+ options: {
+ steps: 6, // steps of zoom
+ max: 300, // max zoom in percent
+ plus_button: undefined,
+ minus_button: undefined
+ },
+
+ _create: function() {
+ var self = this;
+ self._zoom = 0;
+ self.initial_size = [
+ self.element.width(),
+ self.element.height()
+ ];
+ self.initial_position = self.element.offset();
+
+ self.element.css({
+ 'margin': 0,
+ 'position': 'absolute',
+ });
+ self.element.offset(self.initial_position);
+
+ if (self.options.plus_button)
+ self.options.plus_button.click(
+ function(ev) { self.zoom(1); });
+ if (self.options.minus_button)
+ self.options.minus_button.click(
+ function(ev) { self.zoom(-1); });
+
+ function contain(event, ui) {
+ var fix = self.allowedPosition(ui.position);
+ console.log("fix: ", fix);
+ if (fix !== undefined) {
+ return false;
+ };
+ };
+ self.element.draggable({drag: contain});
+
+ return self;
+ },
+
+ zoom: function(steps) {
+ var t = this._zoom + steps;
+ return this.zoomTo(t);
+ },
+
+ zoomForStep: function(step) {
+ // 0 => initial
+ // max_step-1 => max %
+ return 100 + (this.options.max - 100) / this.options.steps * step
+ },
+
+ zoomTo: function(level) {
+ if (level < 0 || level > this.options.steps)
+ return;
+ var ratio = this.zoomForStep(level) / 100;
+ var new_width = ratio * this.initial_size[0];
+ var new_height = ratio * this.initial_size[1];
+ var target = {
+ 'width': new_width,
+ 'left': this.initial_position.left - (new_width - this.initial_size[0])/2,
+ 'top': this.initial_position.top - (new_height - this.initial_size[1])/2,
+ };
+ this._zoom = level;
+ this.element.animate(target, 200); // default duration=400
+ },
+
+ allowedPosition: function(off) {
+ var x = undefined, fix_x = undefined;
+ var y = undefined, fix_y = undefined;
+ var w = this.element.width();
+ var h = this.element.height();
+ var cw = $(window).width();
+ var ch = $(window).height();
+ var off = off || this.element.offset();
+
+ if (w <= cw) {
+ var x = off.left;
+ if (x < 0)
+ fix_x = 0;
+ if (x + w > cw)
+ fix_x = cw - w;
+ } else {
+ if (x > 0)
+ fix_x = 0;
+ if (x + w < cw)
+ fix_x = cw - w;
+ }
+
+ if (h <= ch) {
+ var y = off.top;
+ if (y < 0)
+ fix_y = 0;
+ if (y + h > ch)
+ fix_y = ch - h;
+ } else {
+ if (y > 0)
+ fix_y = 0;
+ if (y + h < ch)
+ fix_y = ch - h;
+ }
+ if (fix_x !== undefined || fix_y !== undefined)
+ return { top: fix_y, left: fix_x };
+ return undefined;
+
+ },
+ });
+}(jQuery));
+
+
+$(document).ready(function(){
+ $("img.canvas").pictureviewer({
+ plus_button: $(".toolbar .button.plus"),
+ minus_button: $(".toolbar .button.minus")
+ });
+});
+
fnp / wolnelektury.git / commitdiff