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fixed collision detection for dragged elements

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This commit is contained in:
RossAscends
2023-04-18 04:04:27 +09:00
parent c38a955f96
commit d9bbefb01e
1 changed files with 44 additions and 17 deletions
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61
public/scripts/RossAscends-mods.js
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@ -326,41 +326,66 @@ function dragElement(elmnt) {
e = e || window.event;
e.preventDefault();
// get the mouse cursor position at startup:
pos3 = e.clientX;
pos4 = e.clientY;
pos3 = e.clientX; //mouse X at click
pos4 = e.clientY; //mouse Y at click
document.onmouseup = closeDragElement;
// call a function whenever the cursor moves:
document.onmousemove = elementDrag;
}
function elementDrag(e) {
//disable scrollbars when dragging to prevent jitter
$("body").css("overflow", "hidden");
//get window size
let winWidth = window.innerWidth;
let winHeight = window.innerHeight;
//get necessary data for calculating element footprint
let draggableHeight = parseInt(getComputedStyle(elmnt).getPropertyValue('height').slice(0, -2));
let draggableWidth = parseInt(getComputedStyle(elmnt).getPropertyValue('width').slice(0, -2));
let draggableTop = parseInt(getComputedStyle(elmnt).getPropertyValue('top').slice(0, -2));
let draggableLeft = parseInt(getComputedStyle(elmnt).getPropertyValue('left').slice(0, -2));
e = e || window.event;
e.preventDefault();
// calculate the new cursor position:
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
//set the lowest and most-right pixel the element touches
let maxX = (draggableWidth + draggableLeft);
let maxY = (draggableHeight + draggableTop);
// set the element's new position:
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
// calculate the new cursor position:
e = e || window.event;
e.preventDefault();
pos1 = pos3 - e.clientX; //X change amt
pos2 = pos4 - e.clientY; //Y change amt
pos3 = e.clientX; //new mouse X
pos4 = e.clientY; //new mouse Y
//fix over/underflows:
if (elmnt.offsetTop - pos2 <= 42) { elmnt.style.top = "42px" } //42px barrier for TopBar
if (elmnt.offsetLeft - pos1 <= 0) { elmnt.style.left = "0px" }
if (maxX >= winWidth - 10) { elmnt.style.left = ((elmnt.offsetLeft - pos2) - 10 + "px") }
if (maxY >= winHeight - 10) { elmnt.style.top = ((elmnt.offsetTop - pos1) - 10 + "px") }
//console.log("left/top: " + (elmnt.offsetLeft - pos1) + "/" + (elmnt.offsetTop - pos2) + ", win: " + winWidth + "/" + winHeight + ", max X/Y: " + maxX + "/" + maxY);
if (elmnt.offsetTop - pos2 <= 42) {
//prevent going out of window top + 42px barrier for TopBar (can hide grabber)
elmnt.style.top = "42px";
} else if (elmnt.offsetLeft - pos1 <= 0) {
//prevent moving out of window left
elmnt.style.left = "0px";
} else if (maxX >= winWidth) {
//bounce off right
elmnt.style.left = elmnt.offsetLeft - 20 + "px";
} else if (maxY >= winHeight) {
//bounce off bottom
elmnt.style.top = elmnt.offsetTop - 20 + "px";
} else {
// if no problems, set element's new position
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
}
/* console.log("left/top: " + (elmnt.offsetLeft - pos1) + "/" + (elmnt.offsetTop - pos2) +
", win: " + winWidth + "/" + winHeight +
", max X / Y: " + maxX + " / " + maxY); */
}
@ -368,6 +393,8 @@ function dragElement(elmnt) {
// stop moving when mouse button is released:
document.onmouseup = null;
document.onmousemove = null;
//revert scrolling to normal after drag to allow recovery of vastly misplaced elements
$("body").css("overflow", "auto");
}
}