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| import {
event as domEvent,
matches as domMatches
} from 'min-dom';
/**
* A keyboard abstraction that may be activated and
* deactivated by users at will, consuming key events
* and triggering diagram actions.
*
* The implementation fires the following key events that allow
* other components to hook into key handling:
*
* - keyboard.bind
* - keyboard.unbind
* - keyboard.init
* - keyboard.destroy
*
* All events contain the fields (node, listeners).
*
* A default binding for the keyboard may be specified via the
* `keyboard.bindTo` configuration option.
*
* @param {Config} config
* @param {EventBus} eventBus
* @param {EditorActions} editorActions
*/
export default function Keyboard(config, eventBus, editorActions) {
var self = this;
this._config = config || {};
this._eventBus = eventBus;
this._editorActions = editorActions;
this._listeners = [];
// our key handler is a singleton that passes
// (keycode, modifiers) to each listener.
//
// listeners must indicate that they handled a key event
// by returning true. This stops the event propagation.
//
this._keyHandler = function(event) {
var i, l,
target = event.target,
listeners = self._listeners,
code = event.keyCode || event.charCode || -1;
Iif (target && (domMatches(target, 'input, textarea') || target.contentEditable === 'true')) {
return;
}
for (i = 0; (l = listeners[i]); i++) {
if (l(code, event)) {
event.preventDefault();
event.stopPropagation();
}
}
};
// properly clean dom registrations
eventBus.on('diagram.destroy', function() {
self._fire('destroy');
self.unbind();
self._listeners = null;
});
eventBus.on('diagram.init', function() {
self._fire('init');
});
eventBus.on('attach', function() {
Eif (config && config.bindTo) {
self.bind(config.bindTo);
}
});
eventBus.on('detach', function() {
self.unbind();
});
this._init();
}
Keyboard.$inject = [
'config.keyboard',
'eventBus',
'editorActions'
];
Keyboard.prototype.bind = function(node) {
// make sure that the keyboard is only bound once to the DOM
this.unbind();
this._node = node;
// bind key events
domEvent.bind(node, 'keydown', this._keyHandler, true);
this._fire('bind');
};
Keyboard.prototype.getBinding = function() {
return this._node;
};
Keyboard.prototype.unbind = function() {
var node = this._node;
if (node) {
this._fire('unbind');
// unbind key events
domEvent.unbind(node, 'keydown', this._keyHandler, true);
}
this._node = null;
};
Keyboard.prototype._fire = function(event) {
this._eventBus.fire('keyboard.' + event, { node: this._node, listeners: this._listeners });
};
Keyboard.prototype._init = function() {
var listeners = this._listeners;
var editorActions = this._editorActions,
config = this._config;
// init default listeners
// undo
// (CTRL|CMD) + Z
function undo(key, modifiers) {
Iif (isCmd(modifiers) && !isShift(modifiers) && key === 90) {
editorActions.trigger('undo');
return true;
}
}
// redo
// CTRL + Y
// CMD + SHIFT + Z
function redo(key, modifiers) {
Iif (isCmd(modifiers) && (key === 89 || (key === 90 && isShift(modifiers)))) {
editorActions.trigger('redo');
return true;
}
}
// copy
// CTRL/CMD + C
function copy(key, modifiers) {
Iif (isCmd(modifiers) && (key === 67)) {
editorActions.trigger('copy');
return true;
}
}
// paste
// CTRL/CMD + V
function paste(key, modifiers) {
Iif (isCmd(modifiers) && (key === 86)) {
editorActions.trigger('paste');
return true;
}
}
/**
* zoom in one step
* CTRL + +
*
* 107 = numpad plus
* 187 = regular plus
* 171 = regular plus in Firefox (german keyboard layout)
* 61 = regular plus in Firefox (US keyboard layout)
*/
function zoomIn(key, modifiers) {
if ((key === 107 || key === 187 || key === 171 || key === 61) && isCmd(modifiers)) {
editorActions.trigger('stepZoom', { value: 1 });
return true;
}
}
/**
* zoom out one step
* CTRL + -
*
* 109 = numpad minus
* 189 = regular minus
* 173 = regular minus in Firefox (US and german keyboard layout)
*/
function zoomOut(key, modifiers) {
if ((key === 109 || key === 189 || key === 173) && isCmd(modifiers)) {
editorActions.trigger('stepZoom', { value: -1 });
return true;
}
}
/**
* zoom to the default level
* CTRL + 0
*
* 96 = numpad zero
* 48 = regular zero
*/
function zoomDefault(key, modifiers) {
if ((key === 96 || key === 48) && isCmd(modifiers)) {
editorActions.trigger('zoom', { value: 1 });
return true;
}
}
// delete selected element
// DEL
function removeSelection(key, modifiers) {
Iif (key === 46) {
editorActions.trigger('removeSelection');
return true;
}
}
// move canvas left
// left arrow
//
// 37 = Left
// 38 = Up
// 39 = Right
// 40 = Down
function moveCanvas(key, modifiers) {
if ([37, 38, 39, 40].indexOf(key) >= 0) {
var opts = {
invertY: config.invertY,
speed: (config.speed || 50)
};
switch (key) {
case 37: // Left
opts.direction = 'left';
break;
case 38: // Up
opts.direction = 'up';
break;
case 39: // Right
opts.direction = 'right';
break;
case 40: // Down
opts.direction = 'down';
break;
}
editorActions.trigger('moveCanvas', opts);
return true;
}
}
listeners.push(undo);
listeners.push(redo);
listeners.push(copy);
listeners.push(paste);
listeners.push(removeSelection);
listeners.push(zoomIn);
listeners.push(zoomOut);
listeners.push(zoomDefault);
listeners.push(moveCanvas);
};
/**
* Add a listener function that is notified with (key, modifiers) whenever
* the keyboard is bound and the user presses a key.
*
* @param {Function} listenerFn
*/
Keyboard.prototype.addListener = function(listenerFn) {
this._listeners.push(listenerFn);
};
Keyboard.prototype.hasModifier = hasModifier;
Keyboard.prototype.isCmd = isCmd;
Keyboard.prototype.isShift = isShift;
function hasModifier(modifiers) {
return (modifiers.ctrlKey || modifiers.metaKey || modifiers.shiftKey || modifiers.altKey);
}
function isCmd(modifiers) {
// ensure we don't react to AltGr
// (mapped to CTRL + ALT)
Iif (modifiers.altKey) {
return false;
}
return modifiers.ctrlKey || modifiers.metaKey;
}
function isShift(modifiers) {
return modifiers.shiftKey;
}
|