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Initial version of crop boundary dragging.

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This commit is contained in:
Aaron van Geffen 2020-11-23 18:13:38 +01:00
parent 837c92db44
commit 8e7a09f3f3
1 changed files with 42 additions and 5 deletions
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47
public/js/crop_editor.js
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@ -187,16 +187,19 @@ class CropEditor {
addEvents(event) {
let drag_target = this.image_container;
drag_target.addEventListener('mousedown', this.dragStart);
drag_target.addEventListener('mousemove', this.drag);
drag_target.addEventListener('mouseup', this.dragEnd);
drag_target.addEventListener('mouseout', this.dragEnd);
drag_target.addEventListener('mousedown', this.dragStart.bind(this));
drag_target.addEventListener('mousemove', this.drag.bind(this));
drag_target.addEventListener('mouseup', this.dragEnd.bind(this));
// drag_target.addEventListener('mouseout', this.dragEnd.bind(this));
this.original_image.addEventListener('mousedown', event => {return false});
this.original_image.addEventListener('dragstart', event => {return false});
}
dragStart(event) {
this.isDragging = true;
this.dragStartX = event.pageX - event.target.offsetLeft;
this.dragStartY = event.pageY - event.target.offsetTop;
console.log(`Start @ x=${event.pageX}, y=${event.pageY}, which=${event.which}`);
}
@ -206,13 +209,47 @@ class CropEditor {
}
this.isDragging = false;
console.log(`End @ x=${event.pageX}, y=${event.pageY}, which=${event.which}`);
this.handleDragEvent(event);
}
drag(event) {
if (!this.isDragging) {
return;
}
console.log(`Drag @ x=${event.pageX}, y=${event.pageY}, which=${event.which}`);
// console.log(`Drag @ x=${event.pageX}, y=${event.pageY}, which=${event.which}`);
this.handleDragEvent(event);
}
getScaleFactor() {
let real_width = this.original_image.naturalWidth,
real_height = this.original_image.naturalHeight,
scaled_width = this.original_image.clientWidth,
scaled_height = this.original_image.clientHeight;
return scaled_width / real_width;
}
handleDragEvent(event) {
if (!this.isDragging) {
return;
}
let curX = event.pageX - event.target.offsetLeft,
curY = event.pageY - event.target.offsetTop;
this.dragEndX = Math.max(curX, this.dragStartX);
this.dragEndY = Math.max(curY, this.dragStartY);
this.dragStartX = Math.min(curX, this.dragStartX);
this.dragStartY = Math.min(curY, this.dragStartY);
let scaleFactor = this.getScaleFactor();
this.source_x.value = this.dragStartX;
this.source_y.value = this.dragStartY;
this.crop_width.value = Math.ceil(this.dragEndX / scaleFactor);
this.crop_height.value = Math.ceil(this.dragEndY / scaleFactor);
this.positionBoundary();
}
toggleCropButton() {