Adding upstream version 1.2.1.upstream/1.2.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 284 insertions, 0 deletions

diff --git a/src/draglock.c b/src/draglock.c
new file mode 100644
index 0000000..1ab4678
--- /dev/null
+++ b/src/draglock.c
@@ -0,0 +1,284 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2015 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "draglock.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
+
+static int
+draglock_parse_config(struct draglock *dl, const char *config)
+{
+    int button = 0, target = 0;
+    const char *str = NULL;
+    char *end_str = NULL;
+    int pairs[DRAGLOCK_MAX_BUTTONS] = {0};
+
+    if (!config)
+	    return 0;
+
+    /* empty string disables drag lock */
+    if (*config == '\0') {
+	    dl->mode = DRAGLOCK_DISABLED;
+	    return 0;
+    }
+
+    /* check for a single-number string first, config is "<int>" */
+    button = strtol(config, &end_str, 10);
+    if (*end_str == '\0') {
+	    if (button < 0 || button >= DRAGLOCK_MAX_BUTTONS)
+		    return 1;
+	    /* we allow for button 0 so stacked xorg.conf.d snippets can
+	     * disable the config again */
+	    if (button == 0) {
+		    dl->mode = DRAGLOCK_DISABLED;
+		    return 0;
+	    }
+
+	    return draglock_set_meta(dl, button);
+    }
+
+    dl->mode = DRAGLOCK_DISABLED;
+
+    /* check for a set of button pairs, config is
+     * "<int> <int> <int> <int>..." */
+    str = config;
+    while (*str != '\0') {
+	    button = strtol(str, &end_str, 10);
+	    if (*end_str == '\0')
+		    return 1;
+
+	    str = end_str;
+	    target = strtol(str, &end_str, 10);
+	    if (end_str == str)
+		    return 1;
+	    if (button <= 0 || button >= DRAGLOCK_MAX_BUTTONS || target >= DRAGLOCK_MAX_BUTTONS)
+		    return 1;
+
+	    pairs[button] = target;
+	    str = end_str;
+    }
+
+    return draglock_set_pairs(dl, pairs, ARRAY_SIZE(pairs));
+}
+
+int
+draglock_init_from_string(struct draglock *dl, const char *config)
+{
+	dl->mode = DRAGLOCK_DISABLED;
+
+	dl->meta_button = 0;
+	dl->meta_state = false;
+	memset(dl->lock_pair, 0, sizeof(dl->lock_pair));
+	memset(dl->lock_state, 0, sizeof(dl->lock_state));
+
+	return draglock_parse_config(dl, config);
+}
+
+enum draglock_mode
+draglock_get_mode(const struct draglock *dl)
+{
+	return dl->mode;
+}
+
+int
+draglock_get_meta(const struct draglock *dl)
+{
+	if (dl->mode == DRAGLOCK_META)
+		return dl->meta_button;
+	return 0;
+}
+
+size_t
+draglock_get_pairs(const struct draglock *dl, int *array, size_t nelem)
+{
+	unsigned int i;
+	size_t last = 0;
+
+	if (dl->mode != DRAGLOCK_PAIRS)
+		return 0;
+
+	/* size 1 array with the meta button */
+	if (dl->meta_button) {
+		*array = dl->meta_button;
+		return 1;
+	}
+
+	/* size N array with a[0] == 0, the rest ordered by button number */
+	memset(array, 0, nelem * sizeof(array[0]));
+	for (i = 0; i < nelem && i < ARRAY_SIZE(dl->lock_pair); i++) {
+		array[i] = dl->lock_pair[i];
+		if (array[i] != 0 && i > last)
+			last = i;
+	}
+	return last;
+}
+
+int
+draglock_set_meta(struct draglock *dl, int meta_button)
+{
+	if (meta_button < 0 || meta_button >= DRAGLOCK_MAX_BUTTONS)
+		return 1;
+
+	dl->meta_button = meta_button;
+	dl->mode = meta_button ? DRAGLOCK_META : DRAGLOCK_DISABLED;
+
+	return 0;
+}
+
+int
+draglock_set_pairs(struct draglock *dl, const int *array, size_t nelem)
+{
+	unsigned int i;
+
+	if (nelem == 0 || array[0] != 0)
+		return 1;
+
+	for (i = 0; i < nelem; i++) {
+		if (array[i] < 0 || array[i] >= DRAGLOCK_MAX_BUTTONS)
+			return 1;
+	}
+
+	dl->mode = DRAGLOCK_DISABLED;
+	for (i = 0; i < nelem; i++) {
+		dl->lock_pair[i] = array[i];
+		if (dl->lock_pair[i])
+			dl->mode = DRAGLOCK_PAIRS;
+	}
+
+	return 0;
+}
+
+static int
+draglock_filter_meta(struct draglock *dl, int *button, int *press)
+{
+	int b = *button,
+	    is_press = *press;
+
+	if (b == dl->meta_button) {
+		if (is_press)
+			dl->meta_state = true;
+		*button = 0;
+		return 0;
+	}
+
+	switch (dl->lock_state[b]) {
+	case DRAGLOCK_BUTTON_STATE_NONE:
+		if (dl->meta_state && is_press) {
+			dl->lock_state[b] = DRAGLOCK_BUTTON_STATE_DOWN_1;
+			dl->meta_state = false;
+		}
+		break;
+	case DRAGLOCK_BUTTON_STATE_DOWN_1:
+		if (!is_press) {
+			dl->lock_state[b] = DRAGLOCK_BUTTON_STATE_UP_1;
+			b = 0;
+		}
+		break;
+	case DRAGLOCK_BUTTON_STATE_UP_1:
+		if (is_press) {
+			dl->lock_state[b] = DRAGLOCK_BUTTON_STATE_DOWN_2;
+			b = 0;
+		}
+		break;
+	case DRAGLOCK_BUTTON_STATE_DOWN_2:
+		if (!is_press) {
+			dl->lock_state[b] = DRAGLOCK_BUTTON_STATE_NONE;
+		}
+		break;
+	}
+
+	*button = b;
+
+	return 0;
+}
+
+static int
+draglock_filter_pair(struct draglock *dl, int *button, int *press)
+{
+	int b = *button,
+	    is_press = *press;
+
+	if (dl->lock_pair[b] == 0)
+		return 0;
+
+	switch (dl->lock_state[b]) {
+	case DRAGLOCK_BUTTON_STATE_NONE:
+		if (is_press) {
+			dl->lock_state[b] = DRAGLOCK_BUTTON_STATE_DOWN_1;
+			b = dl->lock_pair[b];
+		}
+		break;
+	case DRAGLOCK_BUTTON_STATE_DOWN_1:
+		if (!is_press) {
+			dl->lock_state[b] = DRAGLOCK_BUTTON_STATE_UP_1;
+			b = 0;
+		}
+		break;
+	case DRAGLOCK_BUTTON_STATE_UP_1:
+		if (is_press) {
+			dl->lock_state[b] = DRAGLOCK_BUTTON_STATE_DOWN_2;
+			b = 0;
+		}
+		break;
+	case DRAGLOCK_BUTTON_STATE_DOWN_2:
+		if (!is_press) {
+			dl->lock_state[b] = DRAGLOCK_BUTTON_STATE_NONE;
+			b = dl->lock_pair[b];
+		}
+		break;
+	}
+
+	*button = b;
+
+	return 0;
+}
+
+int
+draglock_filter_button(struct draglock *dl, int *button, int *is_press)
+{
+	if (*button == 0)
+		return 0;
+
+	switch(dl->mode) {
+	case DRAGLOCK_DISABLED:
+		return 0;
+	case DRAGLOCK_META:
+		return draglock_filter_meta(dl, button, is_press);
+	case DRAGLOCK_PAIRS:
+		return draglock_filter_pair(dl, button, is_press);
+	default:
+		abort();
+		break;
+	}
+
+	return 0;
+}