drap canvas when using processon
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// ==UserScript==
// @name mouse_middle_button_grab
// @namespace
// @version 0.2
// @description drap canvas when using processon
// @author SimonTheCoder
// @match https://www.processon.com/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
console.log("mouse_middle_button_grab loaded.");
var designer_layout = document.getElementById("designer_layout");
if(!designer_layout){
console.log("seems we are drawing mindmap.");
designer_layout = document.getElementById("canvas_container");
}
console.log("designer_layout:"+designer_layout);
var lastX = 0;
var lastY = 0;
var global_test_e = null;
var middle_down = false;
window.onmousedown = function(e) {
if(e.button == 1){
global_test_e = e;
lastX = e.x;
lastY = e.y;
//console.log("middle mouse down. x =" + e.x + " y=" +e.y);
middle_down = true;
}
};
window.onmouseup = function(e){
if(e.button == 1){
global_test_e = e;
lastX = e.x;
lastY = e.y;
//console.log("middle mouse up. x =" + e.x + " y=" +e.y);
middle_down = false;
}
};
window.onmousemove = function(e){
if(e.button == 1 && middle_down === true){
//console.log("middle mouse move. x =" + e.x + " y=" +e.y + " lastx =" + lastX + " lasty=" +lastY );
designer_layout.scrollTop = designer_layout.scrollTop - (e.y - lastY);
designer_layout.scrollLeft = designer_layout.scrollLeft - (e.x - lastX);
lastX = e.x;
lastY = e.y;
}
};
})();