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179 lines
5.1 KiB
JavaScript

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// Get the container to use as a canvas
const container = document.getElementById("container");
const editor = document.getElementById("editor");
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const textForm = document.getElementsByClassName("text-input")[0];
const input = document.getElementById("input");
const insert = document.getElementById("insert");
const cancel = document.getElementById("cancel");
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// List of labels
let labels = [];
let closing = false;
// Start is where the mouse is pressed, End is where the mouse is released
let startX;
let startY;
let endX;
let endY;
// Minimum size for the label to be created
let minimumSizeX = 25;
let minimumSizeY = 25;
// Boolean for showing the editor during drawing
let showEditor = false;
// Store the coordinates and trigger the function
container.addEventListener("mousedown", (e) => {
// Avoid inserting a new label if the user is clicking on a close button)
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if (e.target.tagName !== "BUTTON") {
startX = e.x;
startY = e.y;
// activate the editor
showEditor = true;
editor.classList.add("show-editor");
}
});
container.addEventListener("mouseup", (e) => {
if (e.target.tagName !== "BUTTON") {
endX = e.x;
endY = e.y;
// disable the editor
showEditor = false;
editor.classList.remove("show-editor");
editor.style.width = 0;
editor.style.height = 0;
// draw label
drawLabel();
}
});
// Edit the editor box using transform instead of left / top in order to be more efficient
// (but still with width and height ehm idk if this affects the performance a lot)
// (and it is something we must care of because this event is called like every frame that the mouse is dragged)
container.addEventListener("mousemove", (e) => {
if (showEditor) {
let minX = Math.min(startX, e.x);
let minY = Math.min(startY, e.y);
let maxX = Math.max(startX, e.x);
let maxY = Math.max(startY, e.y);
let width = maxX - minX;
let height = maxY - minY;
// Apply a different class when the sizes pass the minimum size
// (i don't know if is good made like this)
if (width > minimumSizeX && height > minimumSizeY) {
editor.classList.add("can-draw");
} else {
editor.classList.remove("can-draw");
}
editor.style.transform = `translate(${minX}px, ${minY}px)`;
editor.style.width = `${maxX - minX}px`;
editor.style.height = `${maxY - minY}px`;
}
});
// Check the mouse direction and create the Label
// The origin points of the label (because is positioned with top left) are always the lowest x and y values
// The width and height are the greater x and y values (because width and height cannot be negative)
function drawLabel() {
let minX = Math.min(startX, endX);
let minY = Math.min(startY, endY);
let maxX = Math.max(startX, endX);
let maxY = Math.max(startY, endY);
let width = maxX - minX;
let height = maxY - minY;
if (width > minimumSizeX && height > minimumSizeY) {
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// Create a label and push it into the array of labels
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let temporaryLabel = createLabel(minX, minY, width, height, labels.length);
temporaryLabel.classList.add("temporary");
temporaryLabel.id = "temporary-label";
container.appendChild(temporaryLabel);
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new Promise(function (resolve, reject) {
// then if the user click insert and there is a value in the input-- > resolve the promise and return the text input to create the label,
// if the user click cancel-- > reject the promise and don't create the label
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textForm.classList.add("visible");
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input.focus();
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// Insert button
insert.addEventListener("click", (e) => {
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e.preventDefault();
if (input.value) {
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resolve();
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}
});
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// Cancel button
cancel.addEventListener("click", (e) => {
e.preventDefault();
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textForm.classList.remove("visible");
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reject("no input");
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});
}).then(() => {
// Create the label
let label = createLabel(minX, minY, width, height, labels.length);
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// Add the text input to the label
let text = document.createElement("p");
text.classList.add("label--text");
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text.innerHTML = input.value;
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label.appendChild(text);
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labels.push(label);
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container.appendChild(label);
// Reset the modal
input.value = "";
input.blur();
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let tempLabel = document.getElementById("temporary-label");
container.removeChild(tempLabel);
textForm.classList.remove("visible");
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});
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}
}
// Create the label element
function createLabel(x, y, width, height, index, input) {
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let label = document.createElement("div");
label.classList.add("label");
label.style.left = `${x}px`;
label.style.top = `${y}px`;
label.style.width = `${width}px`;
label.style.height = `${height}px`;
// data attribute index maybe we will need it later maybe not
// with the index number of the label
label.setAttribute("data-index", index);
// Insert the number in the label
let labelNumber = document.createElement("p");
labelNumber.classList.add("label--number");
labelNumber.innerHTML = index + 1;
label.appendChild(labelNumber);
// Add a button for deleting the label
// TODO: reactive numbering oh no
let close = document.createElement("button");
close.classList.add("label--close");
close.innerHTML = "x";
close.addEventListener("click", (e) => {
label.remove();
});
label.appendChild(close);
return label;
}