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Convert Resizer to Typescript and create a Percentage based sizer

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Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>
This commit is contained in:
Michael Telatynski 2020-10-12 16:47:04 +01:00
parent c1fef5a941
commit 340e79179e
7 changed files with 205 additions and 92 deletions
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153
src/resizer/resizer.js
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@ -1,153 +0,0 @@
/*
Copyright 2018 New Vector Ltd
Copyright 2019 The Matrix.org Foundation C.I.C.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
classNames:
// class on resize-handle
handle: string
// class on resize-handle
reverse: string
// class on resize-handle
vertical: string
// class on container
resizing: string
*/
export default class Resizer {
// TODO move vertical/horizontal to config option/container class
// as it doesn't make sense to mix them within one container/Resizer
constructor(container, distributorCtor, config) {
if (!container) {
throw new Error("Resizer requires a non-null `container` arg");
}
this.container = container;
this.distributorCtor = distributorCtor;
this.config = config;
this.classNames = {
handle: "resizer-handle",
reverse: "resizer-reverse",
vertical: "resizer-vertical",
resizing: "resizer-resizing",
};
this._onMouseDown = this._onMouseDown.bind(this);
}
setClassNames(classNames) {
this.classNames = classNames;
}
attach() {
this.container.addEventListener("mousedown", this._onMouseDown, false);
}
detach() {
this.container.removeEventListener("mousedown", this._onMouseDown, false);
}
/**
Gives the distributor for a specific resize handle, as if you would have started
to drag that handle. Can be used to manipulate the size of an item programmatically.
@param {number} handleIndex the index of the resize handle in the container
@return {Distributor} a new distributor for the given handle
*/
forHandleAt(handleIndex) {
const handles = this._getResizeHandles();
const handle = handles[handleIndex];
if (handle) {
const {distributor} = this._createSizerAndDistributor(handle);
return distributor;
}
}
forHandleWithId(id) {
const handles = this._getResizeHandles();
const handle = handles.find((h) => h.getAttribute("data-id") === id);
if (handle) {
const {distributor} = this._createSizerAndDistributor(handle);
return distributor;
}
}
isReverseResizeHandle(el) {
return el && el.classList.contains(this.classNames.reverse);
}
isResizeHandle(el) {
return el && el.classList.contains(this.classNames.handle);
}
_onMouseDown(event) {
// use closest in case the resize handle contains
// child dom nodes that can be the target
const resizeHandle = event.target && event.target.closest(`.${this.classNames.handle}`);
if (!resizeHandle || resizeHandle.parentElement !== this.container) {
return;
}
// prevent starting a drag operation
event.preventDefault();
// mark as currently resizing
if (this.classNames.resizing) {
this.container.classList.add(this.classNames.resizing);
}
if (this.config.onResizeStart) {
this.config.onResizeStart();
}
const {sizer, distributor} = this._createSizerAndDistributor(resizeHandle);
distributor.start();
const onMouseMove = (event) => {
const offset = sizer.offsetFromEvent(event);
distributor.resizeFromContainerOffset(offset);
};
const body = document.body;
const finishResize = () => {
if (this.classNames.resizing) {
this.container.classList.remove(this.classNames.resizing);
}
if (this.config.onResizeStop) {
this.config.onResizeStop();
}
distributor.finish();
body.removeEventListener("mouseup", finishResize, false);
document.removeEventListener("mouseleave", finishResize, false);
body.removeEventListener("mousemove", onMouseMove, false);
};
body.addEventListener("mouseup", finishResize, false);
document.addEventListener("mouseleave", finishResize, false);
body.addEventListener("mousemove", onMouseMove, false);
}
_createSizerAndDistributor(resizeHandle) {
const vertical = resizeHandle.classList.contains(this.classNames.vertical);
const reverse = this.isReverseResizeHandle(resizeHandle);
const Distributor = this.distributorCtor;
const sizer = Distributor.createSizer(this.container, vertical, reverse);
const item = Distributor.createItem(resizeHandle, this, sizer);
const distributor = new Distributor(item, this.config);
return {sizer, distributor};
}
_getResizeHandles() {
return Array.from(this.container.children).filter(el => {
return this.isResizeHandle(el);
});
}
}