111 lines
3 KiB
JavaScript
111 lines
3 KiB
JavaScript
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const hotkeys = {};
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hotkeys.HOTKEYS = {};
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hotkeys.HELPS = [];
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hotkeys.hotkey_identifier =
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function hotkey_identifier(key, ctrlKey, shiftKey, altKey)
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{
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// Return the string that will represent this hotkey in the dictionary.
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return key.toLowerCase() + "." + (ctrlKey & 1) + "." + (shiftKey & 1) + "." + (altKey & 1);
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}
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hotkeys.hotkey_human =
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function hotkey_human(key, ctrlKey, shiftKey, altKey)
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{
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// Return the string that will be displayed to the user to represent this hotkey.
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let mods = [];
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if (ctrlKey) { mods.push("CTRL"); }
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if (shiftKey) { mods.push("SHIFT"); }
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if (altKey) { mods.push("ALT"); }
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mods = mods.join("+");
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if (mods) { mods = mods + "+"; }
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return mods + key.toUpperCase();
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}
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hotkeys.register_help =
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function register_help(help)
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{
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hotkeys.HELPS.push(help);
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}
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hotkeys.register_hotkey =
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function register_hotkey(hotkey, action, description)
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{
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if (! Array.isArray(hotkey))
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{
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hotkey = hotkey.split(/\s+/g);
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}
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const key = hotkey.pop();
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modifiers = hotkey.map(word => word.toLocaleLowerCase());
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const ctrlKey = modifiers.includes("control") || modifiers.includes("ctrl");
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const shiftKey = modifiers.includes("shift");
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const altKey = modifiers.includes("alt");
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const identifier = hotkeys.hotkey_identifier(key, ctrlKey, shiftKey, altKey);
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const human = hotkeys.hotkey_human(key, ctrlKey, shiftKey, altKey);
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hotkeys.HOTKEYS[identifier] = {"action": action, "human": human, "description": description}
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}
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hotkeys.should_prevent_hotkey =
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function should_prevent_hotkey(event)
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{
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/*
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If the user is currently in an input element, then the registered hotkey
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will be ignored and the browser will use its default behavior.
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*/
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if (event.target.tagName == "INPUT" && event.target.type == "checkbox")
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{
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return false;
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}
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else
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{
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return common.INPUT_TYPES.has(event.target.tagName);
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}
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}
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hotkeys.show_all_hotkeys =
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function show_all_hotkeys()
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{
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// Display an Alert with a list of all the hotkeys.
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let lines = [];
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for (const identifier in hotkeys.HOTKEYS)
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{
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const line = hotkeys.HOTKEYS[identifier]["human"] + " : " + hotkeys.HOTKEYS[identifier]["description"];
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lines.push(line);
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}
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if (hotkeys.HELPS)
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{
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lines.push("");
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}
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for (const help of hotkeys.HELPS)
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{
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lines.push(help);
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}
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lines = lines.join("\n");
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alert(lines);
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}
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hotkeys.hotkeys_listener =
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function hotkeys_listener(event)
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{
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// console.log(event.key);
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if (hotkeys.should_prevent_hotkey(event))
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{
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return;
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}
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identifier = hotkeys.hotkey_identifier(event.key, event.ctrlKey, event.shiftKey, event.altKey);
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//console.log(identifier);
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if (identifier in hotkeys.HOTKEYS)
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{
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hotkeys.HOTKEYS[identifier]["action"](event);
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event.preventDefault();
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}
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}
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window.addEventListener("keydown", hotkeys.hotkeys_listener);
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hotkeys.register_hotkey("/", hotkeys.show_all_hotkeys, "Show hotkeys.");
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