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https://github.com/libsdl-org/SDL.git
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Add support for modal windows to more platforms
- Adds support for modal windows to Win32, Mac, and Haiku, and enhances functionality on Wayland and X11, which previous set only the parent window, but not the modal state. - Windows can be declared modal at creation time, and the modal state can be toggled at any time via SDL_SetWindowModalFor() (tested with UE5 through sdl2-compat). - Allows dynamic unparenting/reparenting of windows. - Includes a modal window test.
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Semphris
172
test/testmodal.c
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172
test/testmodal.c
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/*
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* Sample program: Create a parent window and a modal child window. */
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.h>
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#include <SDL3/SDL_test.h>
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#include <stdlib.h>
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int main(int argc, char *argv[])
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{
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SDL_Window *w1 = NULL, *w2 = NULL;
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SDL_Renderer *r1 = NULL, *r2 = NULL;
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SDLTest_CommonState *state = NULL;
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Uint64 show_deadline = 0;
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int i;
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int exit_code = 0;
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/* Initialize test framework */
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state = SDLTest_CommonCreateState(argv, 0);
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if (state == NULL) {
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return 1;
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}
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* Parse commandline */
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for (i = 1; i < argc;) {
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int consumed;
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consumed = SDLTest_CommonArg(state, i);
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if (consumed <= 0) {
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static const char *options[] = { NULL };
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SDLTest_CommonLogUsage(state, argv[0], options);
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return 1;
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}
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i += consumed;
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}
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if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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SDL_Log("SDL_Init failed (%s)", SDL_GetError());
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return 1;
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}
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if (SDL_CreateWindowAndRenderer("Parent Window", 640, 480, 0, &w1, &r1)) {
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SDL_Log("Failed to create parent window and/or renderer: %s\n", SDL_GetError());
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exit_code = 1;
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goto sdl_quit;
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}
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SDL_CreateWindowAndRenderer("Non-Modal Window", 320, 200, 0, &w2, &r2);
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if (!w2) {
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SDL_Log("Failed to create parent window and/or renderer: %s\n", SDL_GetError());
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exit_code = 1;
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goto sdl_quit;
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}
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if (!SDL_SetWindowModalFor(w2, w1)) {
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SDL_SetWindowTitle(w2, "Modal Window");
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}
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while (1) {
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int quit = 0;
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SDL_Event e;
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while (SDL_PollEvent(&e)) {
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if (e.type == SDL_EVENT_QUIT) {
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quit = 1;
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break;
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} else if (e.type == SDL_EVENT_WINDOW_CLOSE_REQUESTED) {
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if (e.window.windowID == SDL_GetWindowID(w2)) {
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SDL_DestroyRenderer(r2);
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SDL_DestroyWindow(w2);
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r2 = NULL;
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w2 = NULL;
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} else if (e.window.windowID == SDL_GetWindowID(w1)) {
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SDL_DestroyRenderer(r1);
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SDL_DestroyWindow(w1);
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r1 = NULL;
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w1 = NULL;
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}
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} else if (e.type == SDL_EVENT_KEY_DOWN) {
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if ((e.key.keysym.sym == SDLK_m || e.key.keysym.sym == SDLK_n) && !w2) {
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if (SDL_CreateWindowAndRenderer("Non-Modal Window", 320, 200, SDL_WINDOW_HIDDEN, &w2, &r2) < 0) {
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SDL_Log("Failed to create modal window and/or renderer: %s\n", SDL_GetError());
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exit_code = 1;
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goto sdl_quit;
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}
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if (e.key.keysym.sym == SDLK_m) {
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if (!SDL_SetWindowModalFor(w2, w1)) {
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SDL_SetWindowTitle(w2, "Modal Window");
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}
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}
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SDL_ShowWindow(w2);
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} else if (e.key.keysym.sym == SDLK_ESCAPE && w2) {
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SDL_DestroyWindow(w2);
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r2 = NULL;
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w2 = NULL;
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} else if (e.key.keysym.sym == SDLK_h) {
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if (e.key.keysym.mod & SDL_KMOD_CTRL) {
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/* Hide the parent, which should hide the modal too. */
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show_deadline = SDL_GetTicksNS() + SDL_SECONDS_TO_NS(3);
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SDL_HideWindow(w1);
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} else if (w2) {
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/* Show/hide the modal window */
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if (SDL_GetWindowFlags(w2) & SDL_WINDOW_HIDDEN) {
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SDL_ShowWindow(w2);
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} else {
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SDL_HideWindow(w2);
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}
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}
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} else if (e.key.keysym.sym == SDLK_p && w2) {
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if (SDL_GetWindowFlags(w2) & SDL_WINDOW_MODAL) {
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/* Unparent the window */
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if (!SDL_SetWindowModalFor(w2, NULL)) {
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SDL_SetWindowTitle(w2, "Non-Modal Window");
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}
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} else {
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/* Reparent the window */
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if (!SDL_SetWindowModalFor(w2, w1)) {
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SDL_SetWindowTitle(w2, "Modal Window");
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}
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}
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}
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}
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}
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if (quit) {
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break;
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}
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SDL_Delay(100);
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if (show_deadline && show_deadline <= SDL_GetTicksNS()) {
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SDL_ShowWindow(w1);
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}
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/* Parent window is red */
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if (r1) {
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SDL_SetRenderDrawColor(r1, 224, 48, 12, SDL_ALPHA_OPAQUE);
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SDL_RenderClear(r1);
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SDL_RenderPresent(r1);
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}
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/* Child window is blue */
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if (r2) {
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SDL_SetRenderDrawColor(r2, 6, 76, 255, SDL_ALPHA_OPAQUE);
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SDL_RenderClear(r2);
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SDL_RenderPresent(r2);
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}
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}
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sdl_quit:
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if (w1) {
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/* The child window and renderer will be cleaned up automatically. */
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SDL_DestroyWindow(w1);
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}
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SDL_Quit();
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SDLTest_CommonDestroyState(state);
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return exit_code;
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}
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