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ex_drag_and_drop.c
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ex_drag_and_drop.c
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/* ______ ___ ___
* /\ _ \ /\_ \ /\_ \
* \ \ \L\ \\//\ \ \//\ \ __ __ _ __ ___
* \ \ __ \ \ \ \ \ \ \ /'__`\ /'_ `\/\`'__\/ __`\
* \ \ \/\ \ \_\ \_ \_\ \_/\ __//\ \L\ \ \ \//\ \L\ \
* \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
* \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
* /\____/
* \_/__/
*
* System drag&drop example.
*
* This example shows how an Allegro window can receive pictures
* (and text) from other applications.
*
* See readme.txt for copyright information.
*/
#define ALLEGRO_UNSTABLE
#include <allegro5/allegro.h>
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_ttf.h>
#include <allegro5/allegro_color.h>
#include <allegro5/allegro_image.h>
#include <allegro5/allegro_primitives.h>
#include "common.c"
// We only accept up to 25 lines of text or files at a time.
typedef struct Cell {
char *rows[25];
ALLEGRO_BITMAP *bitmap;
} Cell;
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display;
ALLEGRO_TIMER *timer;
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_FONT *font;
bool done = false;
bool redraw = true;
int xdiv = 3;
int ydiv = 4;
Cell grid[xdiv * ydiv];
int drop_x = -1;
int drop_y = -1;
(void)argc;
(void)argv;
// Initialize everything to NULL
for (int i = 0; i < xdiv * ydiv; i++) {
grid[i].rows[0] = strdup("drop file or text here");
for (int r = 1; r < 25; r++) grid[i].rows[r] = NULL;
grid[i].bitmap = NULL;
}
if (!al_init()) {
abort_example("Failed to init Allegro.\n");
}
al_init_image_addon();
al_init_primitives_addon();
al_init_font_addon();
al_init_ttf_addon();
init_platform_specific();
ALLEGRO_MONITOR_INFO info;
al_get_monitor_info(0, &info);
// Make the window half as wide as the desktop and 4:3 aspect
int w = (info.x2 - info.x1) / 2;
int h = w * 3 / 4;
// Turn on drag/drop support
al_set_new_display_flags(ALLEGRO_DRAG_AND_DROP);
display = al_create_display(w, h);
if (!display) {
abort_example("Error creating display.\n");
}
if (!al_install_keyboard()) {
abort_example("Error installing keyboard.\n");
}
font = al_load_font("data/DejaVuSans.ttf", 20, 0);
if (!font) {
abort_example("Could not load font.\n");
}
timer = al_create_timer(1 / 60.0);
queue = al_create_event_queue();
al_register_event_source(queue, al_get_keyboard_event_source());
al_register_event_source(queue, al_get_timer_event_source(timer));
// drag&drop events will come from the display, if enabled
al_register_event_source(queue, al_get_display_event_source(display));
al_start_timer(timer);
while (!done) {
ALLEGRO_EVENT event;
int fh = al_get_font_line_height(font);
if (redraw && al_is_event_queue_empty(queue)) {
// draw a grid with the dropped text rows or files
ALLEGRO_COLOR c1 = al_color_name("gainsboro");
ALLEGRO_COLOR c2 = al_color_name("orange");
al_clear_to_color(al_map_rgb_f(0, 0, 0));
for (int y = 0; y < ydiv; y++) {
for (int x = 0; x < xdiv; x++) {
int gx = x * w / xdiv;
int gy = y * h / ydiv;
if (grid[x + y * xdiv].bitmap) {
ALLEGRO_BITMAP *bmp = grid[x + y * xdiv].bitmap;
float bw = al_get_bitmap_width(bmp);
float bh = al_get_bitmap_height(bmp);
float s = w / xdiv / bw;
if (s > (h / ydiv - fh) / bh) s = (h / ydiv - fh) / bh;
al_draw_scaled_bitmap(bmp, 0, 0, bw, bh, gx, gy + fh, bw * s, bh * s, 0);
}
for (int r = 0; r < 25; r++) {
if (!grid[x + y * xdiv].rows[r]) break;
al_draw_textf(font, c1, gx, gy + r * fh,
0, "%s", grid[x + y * xdiv].rows[r]);
}
if (drop_x >= gx && drop_x < gx + w / xdiv &&
drop_y >= gy && drop_y < gy + h / ydiv) {
al_draw_rectangle(gx, gy, gx + w / xdiv, gy + h / ydiv, c2, 2);
}
else {
al_draw_rectangle(gx, gy, gx + w / xdiv, gy + h / ydiv, c1, 0);
}
}
}
al_flip_display();
redraw = false;
}
al_wait_for_event(queue, &event);
switch (event.type) {
case ALLEGRO_EVENT_KEY_DOWN:
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
done = true;
}
break;
case ALLEGRO_EVENT_DISPLAY_CLOSE:
done = true;
break;
case ALLEGRO_EVENT_TIMER:
redraw = true;
break;
case ALLEGRO_EVENT_DROP:
drop_x = event.drop.x;
drop_y = event.drop.y;
int col = drop_x * xdiv / w;
int row = drop_y * ydiv / h;
int i = col + row * xdiv;
if (event.drop.text) {
if (event.drop.row == 0) {
// clear the previous contents of the cell
for (int r = 0; r < 25; r++) {
if (grid[i].rows[r]) {
al_free(grid[i].rows[r]);
grid[i].rows[r] = NULL;
}
}
// insert the first row/file
grid[i].rows[0] = event.drop.text;
if (event.drop.is_file) {
// if a file, try and load it as a bitmap to display
if (grid[i].bitmap) al_destroy_bitmap(grid[i].bitmap);
grid[i].bitmap = al_load_bitmap(grid[i].rows[0]);
}
}
else {
if (event.drop.row < 25) {
grid[i].rows[event.drop.row] = event.drop.text;
}
else {
al_free(event.drop.text);
}
}
}
if (event.drop.is_complete) {
// stop highlighting a cell when the drop is completed
drop_x = -1;
drop_y = -1;
}
break;
}
}
al_destroy_font(font);
return 0;
}
/* vim: set sts=3 sw=3 et: */