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js: Tolerate the non-existence of some HTML elements

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Specifically, the permalinks, the apology, and the resizable div.
This commit is contained in:
Ben Harris
2022-10-29 11:58:37 +01:00
parent ea4ba47662
commit 06f6e878a0
2 changed files with 76 additions and 65 deletions
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120
emccpre.js
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@ -472,63 +472,68 @@ function initPuzzle() {
ctx.stroke();
}
resizable_div = document.getElementById("resizable");
resizable_div.appendChild(resize_handle);
resize_handle.id = "resizehandle";
resize_handle.title = "Drag to resize the puzzle. Right-click to restore the default size.";
var resize_xbase = null, resize_ybase = null, restore_pending = false;
var resize_xoffset = null, resize_yoffset = null;
var resize_puzzle = Module.cwrap('resize_puzzle',
'void', ['number', 'number']);
var restore_puzzle_size = Module.cwrap('restore_puzzle_size', 'void', []);
resize_handle.oncontextmenu = function(event) { return false; }
resize_handle.onmousedown = function(event) {
if (event.button == 0) {
var xy = element_coords(onscreen_canvas);
resize_xbase = xy.x + onscreen_canvas.offsetWidth / 2;
resize_ybase = xy.y;
resize_xoffset = xy.x + onscreen_canvas.offsetWidth - event.pageX;
resize_yoffset = xy.y + onscreen_canvas.offsetHeight - event.pageY;
} else {
restore_pending = true;
}
resize_handle.setCapture(true);
event.preventDefault();
};
window.addEventListener("mousemove", function(event) {
if (resize_xbase !== null && resize_ybase !== null) {
var dpr = window.devicePixelRatio || 1;
resize_puzzle(
(event.pageX + resize_xoffset - resize_xbase) * dpr * 2,
(event.pageY + resize_yoffset - resize_ybase) * dpr);
if (resizable_div !== null) {
resizable_div.appendChild(resize_handle);
resize_handle.id = "resizehandle";
resize_handle.title = "Drag to resize the puzzle. Right-click to restore the default size.";
var resize_xbase = null, resize_ybase = null, restore_pending = false;
var resize_xoffset = null, resize_yoffset = null;
var resize_puzzle = Module.cwrap('resize_puzzle',
'void', ['number', 'number']);
var restore_puzzle_size = Module.cwrap('restore_puzzle_size',
'void', []);
resize_handle.oncontextmenu = function(event) { return false; }
resize_handle.onmousedown = function(event) {
if (event.button == 0) {
var xy = element_coords(onscreen_canvas);
resize_xbase = xy.x + onscreen_canvas.offsetWidth / 2;
resize_ybase = xy.y;
resize_xoffset =
xy.x + onscreen_canvas.offsetWidth - event.pageX;
resize_yoffset =
xy.y + onscreen_canvas.offsetHeight - event.pageY;
} else {
restore_pending = true;
}
resize_handle.setCapture(true);
event.preventDefault();
// Chrome insists on selecting text during a resize drag
// no matter what I do
if (window.getSelection)
window.getSelection().removeAllRanges();
else
document.selection.empty(); }
});
window.addEventListener("mouseup", function(event) {
if (resize_xbase !== null && resize_ybase !== null) {
resize_xbase = null;
resize_ybase = null;
onscreen_canvas.focus(); // return focus to the puzzle
event.preventDefault();
} else if (restore_pending) {
// If you have the puzzle at larger than normal size and
// then right-click to restore, I haven't found any way to
// stop Chrome and IE popping up a context menu on the
// revealed piece of document when you release the button
// except by putting the actual restore into a setTimeout.
// Gah.
setTimeout(function() {
restore_pending = false;
restore_puzzle_size();
onscreen_canvas.focus();
}, 20);
event.preventDefault();
}
});
};
window.addEventListener("mousemove", function(event) {
if (resize_xbase !== null && resize_ybase !== null) {
var dpr = window.devicePixelRatio || 1;
resize_puzzle(
(event.pageX + resize_xoffset - resize_xbase) * dpr * 2,
(event.pageY + resize_yoffset - resize_ybase) * dpr);
event.preventDefault();
// Chrome insists on selecting text during a resize drag
// no matter what I do
if (window.getSelection)
window.getSelection().removeAllRanges();
else
document.selection.empty(); }
});
window.addEventListener("mouseup", function(event) {
if (resize_xbase !== null && resize_ybase !== null) {
resize_xbase = null;
resize_ybase = null;
onscreen_canvas.focus(); // return focus to the puzzle
event.preventDefault();
} else if (restore_pending) {
// If you have the puzzle at larger than normal size and
// then right-click to restore, I haven't found any way to
// stop Chrome and IE popping up a context menu on the
// revealed piece of document when you release the button
// except by putting the actual restore into a setTimeout.
// Gah.
setTimeout(function() {
restore_pending = false;
restore_puzzle_size();
onscreen_canvas.focus();
}, 20);
event.preventDefault();
}
});
}
/*
* Arrange to detect changes of device pixel ratio. Adapted from
@ -558,7 +563,8 @@ function initPuzzle() {
// we haven't crashed for one reason or another during setup, then
// it's probably safe to hide the 'sorry, no puzzle here' div and
// show the div containing the actual puzzle.
document.getElementById("apology").style.display = "none";
var apology = document.getElementById("apology");
if (apology !== null) apology.style.display = "none";
document.getElementById("puzzle").style.display = "";
};
}