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Provide current thoughts on Qt and the keyboard.

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This commit is contained in:
Thomas Harte 2020-07-06 22:27:50 -04:00
parent 24b03f733f
commit abe1e7f244
2 changed files with 32 additions and 6 deletions
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36
OSBindings/Qt/mainwindow.cpp
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@ -768,10 +768,40 @@ void MainWindow::keyReleaseEvent(QKeyEvent *event) {
bool MainWindow::processEvent(QKeyEvent *event) {
if(!machine) return true;
// First version: support keyboard input only.
const auto keyboardMachine = machine->keyboard_machine();
if(!keyboardMachine) return true;
// Qt is the worst.
//
// Assume your keyboard has a key labelled both . and >, as they do on US and UK keyboards. Call it the dot key.
// Perform the following:
// 1. press dot key;
// 2. press shift key;
// 3. release dot key;
// 4. release shift key.
//
// Per empirical testing, and key repeat aside, on both macOS and Ubuntu 19.04 that sequence will result in
// _three_ keypress events, but only _two_ key release events. You'll get presses for Qt::Key_Period, Qt::Key_Greater
// and Qt::Key_Shift. You'll get releases only for Qt::Key_Greater and Qt::Key_Shift.
//
// How can you detect at runtime that Key_Greater and Key_Period are the same physical key?
//
// You can't. On Ubuntu they have the same values for QKeyEvent::nativeScanCode(), which are unique to the key,
// but they have different ::nativeVirtualKey()s.
//
// On macOS they have the same ::nativeScanCode() only because on macOS [almost] all keys have the same
// ::nativeScanCode(). So that's not usable. They have the same ::nativeVirtualKey()s, but since that isn't true
// on Ubuntu, that's also not usable.
//
// So how can you track the physical keys on a keyboard via Qt?
//
// You can't. Qt is the worst. SDL doesn't have this problem, including in X11, so this seems to be a problem
// Qt has invented for itself.
//
// TODO: find a workaround. Platform-specific use of either nativeScanCode() or nativeVirtualKey() maybe,
// but if so, how to interpret the meaning?
#define BIND2(qtKey, clkKey) case Qt::qtKey: key = Inputs::Keyboard::Key::clkKey; break;
#define BIND(key) BIND2(Key_##key, key)
@ -779,10 +809,6 @@ bool MainWindow::processEvent(QKeyEvent *event) {
switch(event->key()) {
default: return true;
// TODO: Qt factors in modifiers when deciding which key to declare has been pressed.
// E.g. on my keyboard a shifted Key_Comma produces a Key_Less, not a Key_Comma and a shift.
// Find a way to disable that, or else work around it here.
BIND(Escape);
BIND(F1); BIND(F2); BIND(F3); BIND(F4); BIND(F5); BIND(F6);
BIND(F7); BIND(F8); BIND(F9); BIND(F10); BIND(F11); BIND(F12);

2
README.md
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@ -4,7 +4,7 @@ Clock Signal ('CLK') is an emulator for tourists that seeks to be invisible. Use
[Releases](https://github.com/TomHarte/CLK/releases) are hosted on GitHub.
On the Mac it is a native Cocoa application; under Linux, BSD and other UNIXes and UNIX-alikes it can be built either with Qt or with SDL.
On the Mac it is a native Cocoa application; under Linux, BSD and other UNIXes and UNIX-alikes it can be built either with Qt or with SDL; the Qt build should be considered preliminary, pending a sustainable workaround for its keyboard handling.
So its aims are:
* single-click load of any piece of source media for any supported platform;