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236 lines
8.8 KiB
C
236 lines
8.8 KiB
C
/*
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* This example code lets the user copy and paste with the system clipboard.
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*
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* This only handles text, but SDL supports other data types, too.
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*
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* This code is public domain. Feel free to use it for any purpose!
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*/
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#define SDL_MAIN_USE_CALLBACKS 1 /* use the callbacks instead of main() */
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.h>
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#include "../../save-rendering-to-bitmaps.h"
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/* We will use this renderer to draw into this window every frame. */
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static SDL_Window *window = NULL;
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static SDL_Renderer *renderer = NULL;
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static const char *copybuttonstr = "Click here to copy!";
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static const char *pastebuttonstr = "Click here to paste!";
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static SDL_FRect currenttimerect;
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static SDL_FRect copybuttonrect;
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static SDL_FRect pastetextrect;
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static SDL_FRect pastebuttonrect;
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static bool copy_pressed = false;
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static bool paste_pressed = false;
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static char current_time[64];
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static char *pasted_str = NULL;
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static void CalculateCurrentTimeString(void)
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{
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SDL_Time ticks = 0;
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SDL_DateTime dt;
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if (!SDL_GetCurrentTime(&ticks) || !SDL_TimeToDateTime(ticks, &dt, true)) {
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SDL_snprintf(current_time, sizeof (current_time), "(Don't know the current time, sorry.)");
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} else {
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static const char *month[12] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
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static const char *day[7] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
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SDL_snprintf(current_time, sizeof (current_time), "%s, %s %d, %d %02d:%02d:%02d", day[dt.day_of_week], month[dt.month-1], dt.day, dt.year, dt.hour, dt.minute, dt.second);
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}
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}
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/* This function runs once at startup. */
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SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
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{
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SDL_SetAppMetadata("Example Misc Clipboard", "1.0", "com.example.misc-clipboard");
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if (!SDL_Init(SDL_INIT_VIDEO)) {
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SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
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return SDL_APP_FAILURE;
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}
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if (!SDL_CreateWindowAndRenderer("examples/misc/clipboard", 640, 480, 0, &window, &renderer)) {
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SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
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return SDL_APP_FAILURE;
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}
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CalculateCurrentTimeString();
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/* set up the locations where we'll draw stuff. */
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currenttimerect.x = 30;
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currenttimerect.y = 10;
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currenttimerect.w = 390;
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currenttimerect.h = SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE + 10;
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copybuttonrect.x = currenttimerect.x + currenttimerect.w + 30;
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copybuttonrect.y = currenttimerect.y;
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copybuttonrect.w = (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * SDL_strlen(copybuttonstr)) + 10;
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copybuttonrect.h = currenttimerect.h;
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pastetextrect.x = 10;
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pastetextrect.y = currenttimerect.y + currenttimerect.h + 10;
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pastetextrect.w = 620;
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pastetextrect.h = ((480 - pastetextrect.y) - copybuttonrect.h) - 20;
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pastebuttonrect.w = (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * SDL_strlen(pastebuttonstr)) + 10;
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pastebuttonrect.x = (640 - pastebuttonrect.w) / 2.0f;
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pastebuttonrect.y = pastetextrect.y + pastetextrect.h + 10;
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pastebuttonrect.h = copybuttonrect.h;
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return SDL_APP_CONTINUE; /* carry on with the program! */
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}
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/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
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SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
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{
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if (event->type == SDL_EVENT_QUIT) {
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return SDL_APP_SUCCESS; /* end the program, reporting success to the OS. */
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} else if (event->type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
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if (event->button.button == SDL_BUTTON_LEFT) {
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const SDL_FPoint p = { event->button.x, event->button.y };
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copy_pressed = SDL_PointInRectFloat(&p, ©buttonrect);
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paste_pressed = SDL_PointInRectFloat(&p, &pastebuttonrect);
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}
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} else if (event->type == SDL_EVENT_MOUSE_BUTTON_UP) {
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if (event->button.button == SDL_BUTTON_LEFT) {
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const SDL_FPoint p = { event->button.x, event->button.y };
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if (copy_pressed && SDL_PointInRectFloat(&p, ©buttonrect)) {
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SDL_SetClipboardText(current_time);
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} else if (paste_pressed && SDL_PointInRectFloat(&p, &pastebuttonrect)) {
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SDL_free(pasted_str);
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pasted_str = SDL_GetClipboardText();
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}
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copy_pressed = paste_pressed = false;
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}
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}
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return SDL_APP_CONTINUE; /* carry on with the program! */
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}
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static void RenderPastedText(void)
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{
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char *str = pasted_str;
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if (str) {
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float x = pastetextrect.x + 5;
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float y = pastetextrect.y + 5;
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const float w = pastetextrect.w - 10;
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const float h = pastetextrect.h;
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const size_t max_chars_per_line = (size_t) (w / SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE);
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char *newline;
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size_t slen;
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char ch;
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/* this doesn't wordwrap, or deal with Unicode....this is just a simple example app! */
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while ((newline = SDL_strchr(str, '\n')) != NULL) {
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const bool ignore_cr = ((newline > str) && (newline[-1] == '\r'));
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if (ignore_cr) {
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newline[-1] = '\0';
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}
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*newline = '\0';
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slen = SDL_strlen(str); /* length to end of line. */
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slen = SDL_min(slen, max_chars_per_line);
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ch = str[slen];
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str[slen] = '\0';
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SDL_RenderDebugText(renderer, x, y, str);
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str[slen] = ch;
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if (ignore_cr) {
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newline[-1] = '\r';
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}
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*newline = '\n';
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str = newline + 1;
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y += (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE + 2);
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if ((h - y) < SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE) {
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break; // no space for another line, stop here.
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}
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}
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/* last text after newline, if there's room. */
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if ((h - y) >= SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE) {
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slen = SDL_strlen(str); /* length to end of line. */
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slen = SDL_min(slen, max_chars_per_line);
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ch = str[slen];
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str[slen] = '\0';
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SDL_RenderDebugText(renderer, x, y, str);
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str[slen] = ch;
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}
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}
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}
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/* This function runs once per frame, and is the heart of the program. */
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SDL_AppResult SDL_AppIterate(void *appstate)
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{
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float x, y;
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CalculateCurrentTimeString();
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); /* black */
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SDL_RenderClear(renderer);
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/* draw a frame around the current time. */
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SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
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SDL_RenderFillRect(renderer, ¤ttimerect);
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
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SDL_RenderRect(renderer, ¤ttimerect);
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/* draw the current time inside the frame. */
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x = currenttimerect.x + ((currenttimerect.w - (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * SDL_strlen(current_time))) / 2.0f);
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y = currenttimerect.y + 5;
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SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255);
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SDL_RenderDebugText(renderer, x, y, current_time);
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/* draw a frame for the "copy the current time to the clipboard" button. */
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if (copy_pressed) {
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SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
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} else {
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SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
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}
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SDL_RenderFillRect(renderer, ©buttonrect);
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
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SDL_RenderRect(renderer, ©buttonrect);
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/* draw the "copy this text" button string. */
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
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SDL_RenderDebugText(renderer, copybuttonrect.x + 5, copybuttonrect.y + 5, copybuttonstr);
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/* draw a frame for the pasted text area. */
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SDL_SetRenderDrawColor(renderer, 0, 53, 25, 255);
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SDL_RenderFillRect(renderer, &pastetextrect);
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
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SDL_RenderRect(renderer, &pastetextrect);
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/* draw pasted text. */
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SDL_SetRenderDrawColor(renderer, 0, 219, 107, 255);
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RenderPastedText();
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/* draw a frame for the "paste from the clipboard" button. */
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if (paste_pressed) {
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SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
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} else {
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SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
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}
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SDL_RenderFillRect(renderer, &pastebuttonrect);
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
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SDL_RenderRect(renderer, &pastebuttonrect);
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/* draw the "paste some text" button string. */
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
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SDL_RenderDebugText(renderer, pastebuttonrect.x + 5, pastebuttonrect.y + 5, pastebuttonstr);
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/* put the new rendering on the screen. */
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SDL_RenderPresent(renderer);
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return SDL_APP_CONTINUE; /* carry on with the program! */
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}
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/* This function runs once at shutdown. */
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void SDL_AppQuit(void *appstate, SDL_AppResult result)
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{
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SDL_free(pasted_str);
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/* SDL will clean up the window/renderer for us. */
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}
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