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joplin/ElectronClient/app/gui/VerticalResizer.jsx

103 lines
2.5 KiB
JavaScript

const React = require("react");
const electron = require('electron');
class VerticalResizer extends React.PureComponent {
constructor() {
super();
this.state = {
parentRight: 0,
parentHeight: 0,
parentWidth: 0,
drag: {
startX: 0,
lastX: 0,
},
};
this.onDragStart = this.onDragStart.bind(this);
this.onDrag = this.onDrag.bind(this);
this.onDragEnd = this.onDragEnd.bind(this);
this.document_onDragOver = this.document_onDragOver.bind(this);
}
document_onDragOver(event) {
// This is just to prevent the cursor from changing to a "+" as it's dragged
// over other elements. With this it stays a normal cursor.
event.dataTransfer.dropEffect = 'none';
}
onDragStart(event) {
document.addEventListener('dragover', this.document_onDragOver)
event.dataTransfer.dropEffect= 'none';
const cursor = electron.screen.getCursorScreenPoint();
this.setState({
drag: {
startX: cursor.x,
lastX: cursor.x,
}
});
if (this.props.onDragStart) this.props.onDragStart({});
}
onDrag(event) {
// If we got a drag event with no buttons pressed, it's the last drag event
// that we should ignore, because it's sometimes use to put the dragged element
// back to its original position (if there was no valid drop target), which we don't want.
// Also if clientX, screenX, etc. are 0, it's also the last event and we want to ignore these buggy values.
// const e = event.nativeEvent;
// if (!e.buttons || (!e.clientX && !e.clientY && !e.screenX && !e.screenY)) return;
const cursor = electron.screen.getCursorScreenPoint();
const newX = cursor.x;
const delta = newX - this.state.drag.lastX;
if (!delta) return;
this.setState({
drag: Object.assign({}, this.state.drag, { lastX: newX }),
}, () => {
this.props.onDrag({ deltaX: delta });
});
}
onDragEnd(event) {
document.removeEventListener('dragover', this.document_onDragOver);
}
componentWillUnmount() {
document.removeEventListener('dragover', this.document_onDragOver);
}
render() {
const debug = false;
const rootStyle = Object.assign({}, {
height: '100%',
width:5,
borderColor:'red',
borderWidth: debug ? 1 : 0,
borderStyle:'solid',
cursor: 'col-resize',
boxSizing: 'border-box',
opacity: 0,
}, this.props.style);
return (
<div
style={rootStyle}
draggable={true}
onDragStart={this.onDragStart}
onDrag={this.onDrag}
onDragEnd={this.onDragEnd}
/>
);
}
}
module.exports = VerticalResizer;