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-rw-r--r--fiv-browser.c1064
1 files changed, 1064 insertions, 0 deletions
diff --git a/fiv-browser.c b/fiv-browser.c
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+++ b/fiv-browser.c
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+//
+// fiv-browser.c: fast image viewer - filesystem browser widget
+//
+// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+
+#include <math.h>
+#include <pixman.h>
+
+#include "fiv-browser.h"
+#include "fiv-io.h"
+#include "fiv-view.h"
+
+// --- Widget ------------------------------------------------------------------
+// _________________________________
+// │ p a d d i n g
+// │ p ╭───────────────────╮ s ╭┄┄┄┄┄
+// │ a │ glow border ┊ │ p ┊
+// │ d │ ┄ ╔═══════════╗ ┄ │ a ┊
+// │ d │ ║ thumbnail ║ │ c ┊ ...
+// │ i │ ┄ ╚═══════════╝ ┄ │ i ┊
+// │ n │ ┊ glow border │ n ┊
+// │ g ╰───────────────────╯ g ╰┄┄┄┄┄
+// │ s p a c i n g
+// │ ╭┄┄┄┄┄┄┄┄┄┄┄┄╮ ╭┄┄┄┄┄┄┄┄┄┄┄┄
+//
+// The glow is actually a glowing margin, the border is rendered in two parts.
+//
+
+struct _FivBrowser {
+ GtkWidget parent_instance;
+
+ FivIoThumbnailSize item_size; ///< Thumbnail size
+ int item_height; ///< Thumbnail height in pixels
+ int item_spacing; ///< Space between items in pixels
+
+ GArray *entries; ///< [Entry]
+ GArray *layouted_rows; ///< [Row]
+ int selected;
+
+ GdkCursor *pointer; ///< Cached pointer cursor
+ cairo_surface_t *glow; ///< CAIRO_FORMAT_A8 mask
+ int item_border_x; ///< L/R .item margin + border
+ int item_border_y; ///< T/B .item margin + border
+};
+
+typedef struct entry Entry;
+typedef struct item Item;
+typedef struct row Row;
+
+static const double g_permitted_width_multiplier = 2;
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct entry {
+ char *uri; ///< GIO URI
+ cairo_surface_t *thumbnail; ///< Prescaled thumbnail
+ GIcon *icon; ///< If no thumbnail, use this icon
+};
+
+static void
+entry_free(Entry *self)
+{
+ g_free(self->uri);
+ g_clear_pointer(&self->thumbnail, cairo_surface_destroy);
+ g_clear_object(&self->icon);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+struct item {
+ const Entry *entry;
+ int x_offset; ///< Offset within the row
+};
+
+struct row {
+ Item *items; ///< Ends with a NULL entry
+ int x_offset; ///< Start position outside borders
+ int y_offset; ///< Start position inside borders
+};
+
+static void
+row_free(Row *self)
+{
+ g_free(self->items);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+static void
+append_row(FivBrowser *self, int *y, int x, GArray *items_array)
+{
+ if (self->layouted_rows->len)
+ *y += self->item_spacing;
+
+ *y += self->item_border_y;
+ g_array_append_val(self->layouted_rows, ((Row) {
+ .items = g_array_steal(items_array, NULL),
+ .x_offset = x,
+ .y_offset = *y,
+ }));
+
+ // Not trying to pack them vertically, but this would be the place to do it.
+ *y += self->item_height;
+ *y += self->item_border_y;
+}
+
+static int
+relayout(FivBrowser *self, int width)
+{
+ GtkWidget *widget = GTK_WIDGET(self);
+ GtkStyleContext *style = gtk_widget_get_style_context(widget);
+
+ GtkBorder padding = {};
+ gtk_style_context_get_padding(style, GTK_STATE_FLAG_NORMAL, &padding);
+ int available_width = width - padding.left - padding.right;
+
+ g_array_set_size(self->layouted_rows, 0);
+
+ GArray *items = g_array_new(TRUE, TRUE, sizeof(Item));
+ int x = 0, y = padding.top;
+ for (guint i = 0; i < self->entries->len; i++) {
+ const Entry *entry = &g_array_index(self->entries, Entry, i);
+ if (!entry->thumbnail)
+ continue;
+
+ int width = cairo_image_surface_get_width(entry->thumbnail) +
+ 2 * self->item_border_x;
+ if (!items->len) {
+ // Just insert it, whether or not there's any space.
+ } else if (x + self->item_spacing + width <= available_width) {
+ x += self->item_spacing;
+ } else {
+ append_row(self, &y,
+ padding.left + MAX(0, available_width - x) / 2, items);
+ x = 0;
+ }
+
+ g_array_append_val(items,
+ ((Item) {.entry = entry, .x_offset = x + self->item_border_x}));
+ x += width;
+ }
+ if (items->len) {
+ append_row(self, &y,
+ padding.left + MAX(0, available_width - x) / 2, items);
+ }
+
+ g_array_free(items, TRUE);
+ return y + padding.bottom;
+}
+
+static void
+draw_outer_border(FivBrowser *self, cairo_t *cr, int width, int height)
+{
+ int offset_x = cairo_image_surface_get_width(self->glow);
+ int offset_y = cairo_image_surface_get_height(self->glow);
+ cairo_pattern_t *mask = cairo_pattern_create_for_surface(self->glow);
+ cairo_matrix_t matrix;
+
+ cairo_pattern_set_extend(mask, CAIRO_EXTEND_PAD);
+ cairo_save(cr);
+ cairo_translate(cr, -offset_x, -offset_y);
+ cairo_rectangle(cr, 0, 0, offset_x + width, offset_y + height);
+ cairo_clip(cr);
+ cairo_mask(cr, mask);
+ cairo_restore(cr);
+ cairo_save(cr);
+ cairo_translate(cr, width + offset_x, height + offset_y);
+ cairo_rectangle(cr, 0, 0, -offset_x - width, -offset_y - height);
+ cairo_clip(cr);
+ cairo_scale(cr, -1, -1);
+ cairo_mask(cr, mask);
+ cairo_restore(cr);
+
+ cairo_pattern_set_extend(mask, CAIRO_EXTEND_NONE);
+ cairo_matrix_init_scale(&matrix, -1, 1);
+ cairo_matrix_translate(&matrix, -width - offset_x, offset_y);
+ cairo_pattern_set_matrix(mask, &matrix);
+ cairo_mask(cr, mask);
+ cairo_matrix_init_scale(&matrix, 1, -1);
+ cairo_matrix_translate(&matrix, offset_x, -height - offset_y);
+ cairo_pattern_set_matrix(mask, &matrix);
+ cairo_mask(cr, mask);
+
+ cairo_pattern_destroy(mask);
+}
+
+static GdkRectangle
+item_extents(FivBrowser *self, const Item *item, const Row *row)
+{
+ int width = cairo_image_surface_get_width(item->entry->thumbnail);
+ int height = cairo_image_surface_get_height(item->entry->thumbnail);
+ return (GdkRectangle) {
+ .x = row->x_offset + item->x_offset,
+ .y = row->y_offset + self->item_height - height,
+ .width = width,
+ .height = height,
+ };
+}
+
+static const Entry *
+entry_at(FivBrowser *self, int x, int y)
+{
+ for (guint i = 0; i < self->layouted_rows->len; i++) {
+ const Row *row = &g_array_index(self->layouted_rows, Row, i);
+ for (Item *item = row->items; item->entry; item++) {
+ GdkRectangle extents = item_extents(self, item, row);
+ if (x >= extents.x &&
+ y >= extents.y &&
+ x <= extents.x + extents.width &&
+ y <= extents.y + extents.height)
+ return item->entry;
+ }
+ }
+ return NULL;
+}
+
+static void
+draw_row(FivBrowser *self, cairo_t *cr, const Row *row)
+{
+ GtkStyleContext *style = gtk_widget_get_style_context(GTK_WIDGET(self));
+ gtk_style_context_save(style);
+ gtk_style_context_add_class(style, "item");
+
+ GdkRGBA glow_color = {};
+ GtkStateFlags state = gtk_style_context_get_state (style);
+ gtk_style_context_get_color(style, state, &glow_color);
+
+ GtkBorder border;
+ gtk_style_context_get_border(style, state, &border);
+ for (Item *item = row->items; item->entry; item++) {
+ cairo_save(cr);
+ GdkRectangle extents = item_extents(self, item, row);
+ cairo_translate(cr, extents.x - border.left, extents.y - border.top);
+
+ gtk_style_context_save(style);
+ if (item->entry->icon) {
+ gtk_style_context_add_class(style, "symbolic");
+ } else {
+ gdk_cairo_set_source_rgba(cr, &glow_color);
+ draw_outer_border(self, cr,
+ border.left + extents.width + border.right,
+ border.top + extents.height + border.bottom);
+ }
+
+ gtk_render_background(
+ style, cr, border.left, border.top, extents.width, extents.height);
+
+ gtk_render_frame(style, cr, 0, 0,
+ border.left + extents.width + border.right,
+ border.top + extents.height + border.bottom);
+
+ if (item->entry->icon) {
+ GdkRGBA color = {};
+ gtk_style_context_get_color(style, state, &color);
+ gdk_cairo_set_source_rgba(cr, &color);
+ cairo_mask_surface(
+ cr, item->entry->thumbnail, border.left, border.top);
+ } else {
+ cairo_set_source_surface(
+ cr, item->entry->thumbnail, border.left, border.top);
+ cairo_paint(cr);
+ }
+
+ cairo_restore(cr);
+ gtk_style_context_restore(style);
+ }
+ gtk_style_context_restore(style);
+}
+
+// --- Thumbnails --------------------------------------------------------------
+
+// NOTE: "It is important to note that when an image with an alpha channel is
+// scaled, linear encoded, pre-multiplied component values must be used!"
+static cairo_surface_t *
+rescale_thumbnail(cairo_surface_t *thumbnail, double row_height)
+{
+ if (!thumbnail)
+ return thumbnail;
+
+ int width = cairo_image_surface_get_width(thumbnail);
+ int height = cairo_image_surface_get_height(thumbnail);
+
+ double scale_x = 1;
+ double scale_y = 1;
+ if (width > g_permitted_width_multiplier * height) {
+ scale_x = g_permitted_width_multiplier * row_height / width;
+ scale_y = round(scale_x * height) / height;
+ } else {
+ scale_y = row_height / height;
+ scale_x = round(scale_y * width) / width;
+ }
+ if (scale_x == 1 && scale_y == 1)
+ return thumbnail;
+
+ int projected_width = round(scale_x * width);
+ int projected_height = round(scale_y * height);
+ cairo_surface_t *scaled = cairo_image_surface_create(
+ CAIRO_FORMAT_ARGB32, projected_width, projected_height);
+
+ // pixman can take gamma into account when scaling, unlike Cairo.
+ struct pixman_f_transform xform_floating;
+ struct pixman_transform xform;
+
+ // PIXMAN_a8r8g8b8_sRGB can be used for gamma-correct results,
+ // but it's an incredibly slow transformation
+ pixman_format_code_t format = PIXMAN_a8r8g8b8;
+
+ pixman_image_t *src = pixman_image_create_bits(format, width, height,
+ (uint32_t *) cairo_image_surface_get_data(thumbnail),
+ cairo_image_surface_get_stride(thumbnail));
+ pixman_image_t *dest = pixman_image_create_bits(format,
+ cairo_image_surface_get_width(scaled),
+ cairo_image_surface_get_height(scaled),
+ (uint32_t *) cairo_image_surface_get_data(scaled),
+ cairo_image_surface_get_stride(scaled));
+
+ pixman_f_transform_init_scale(&xform_floating, scale_x, scale_y);
+ pixman_f_transform_invert(&xform_floating, &xform_floating);
+ pixman_transform_from_pixman_f_transform(&xform, &xform_floating);
+ pixman_image_set_transform(src, &xform);
+ pixman_image_set_filter(src, PIXMAN_FILTER_BILINEAR, NULL, 0);
+ pixman_image_set_repeat(src, PIXMAN_REPEAT_PAD);
+
+ pixman_image_composite(PIXMAN_OP_SRC, src, NULL, dest, 0, 0, 0, 0, 0, 0,
+ projected_width, projected_height);
+ pixman_image_unref(src);
+ pixman_image_unref(dest);
+
+ cairo_surface_destroy(thumbnail);
+ cairo_surface_mark_dirty(scaled);
+ return scaled;
+}
+
+static void
+entry_add_thumbnail(gpointer data, gpointer user_data)
+{
+ Entry *self = data;
+ g_clear_object(&self->icon);
+ g_clear_pointer(&self->thumbnail, cairo_surface_destroy);
+
+ FivBrowser *browser = FIV_BROWSER(user_data);
+ GFile *file = g_file_new_for_uri(self->uri);
+ self->thumbnail = rescale_thumbnail(
+ fiv_io_lookup_thumbnail(file, browser->item_size),
+ browser->item_height);
+ if (self->thumbnail)
+ goto out;
+
+ // Fall back to symbolic icons, though there's only so much we can do
+ // in parallel--GTK+ isn't thread-safe.
+ GFileInfo *info = g_file_query_info(file,
+ G_FILE_ATTRIBUTE_STANDARD_NAME
+ "," G_FILE_ATTRIBUTE_STANDARD_SYMBOLIC_ICON,
+ G_FILE_QUERY_INFO_NONE, NULL, NULL);
+ if (info) {
+ GIcon *icon = g_file_info_get_symbolic_icon(info);
+ if (icon)
+ self->icon = g_object_ref(icon);
+ g_object_unref(info);
+ }
+out:
+ g_object_unref(file);
+}
+
+static void
+materialize_icon(FivBrowser *self, Entry *entry)
+{
+ if (!entry->icon)
+ return;
+
+ // Fucker will still give us non-symbolic icons, no more playing nice.
+ // TODO(p): Investigate a bit closer. We may want to abandon the idea
+ // of using GLib to look up icons for us, derive a list from a guessed
+ // MIME type, with "-symbolic" prefixes and fallbacks,
+ // and use gtk_icon_theme_choose_icon() instead.
+ // TODO(p): Make sure we have /some/ icon for every entry.
+ // TODO(p): We might want to populate these on an as-needed basis.
+ GtkIconInfo *icon_info = gtk_icon_theme_lookup_by_gicon(
+ gtk_icon_theme_get_default(), entry->icon, self->item_height / 2,
+ GTK_ICON_LOOKUP_FORCE_SYMBOLIC);
+ if (!icon_info)
+ return;
+
+ // Bílá, bílá, bílá, bílá... komu by se nelíbí-lá...
+ // We do not want any highlights, nor do we want to remember the style.
+ const GdkRGBA white = {1, 1, 1, 1};
+ GdkPixbuf *pixbuf = gtk_icon_info_load_symbolic(
+ icon_info, &white, &white, &white, &white, NULL, NULL);
+ if (pixbuf) {
+ int outer_size = self->item_height;
+ entry->thumbnail =
+ cairo_image_surface_create(CAIRO_FORMAT_A8, outer_size, outer_size);
+
+ // "Note that the resulting pixbuf may not be exactly this size;"
+ // though GTK_ICON_LOOKUP_FORCE_SIZE is also an option.
+ int x = (outer_size - gdk_pixbuf_get_width(pixbuf)) / 2;
+ int y = (outer_size - gdk_pixbuf_get_height(pixbuf)) / 2;
+
+ cairo_t *cr = cairo_create(entry->thumbnail);
+ gdk_cairo_set_source_pixbuf(cr, pixbuf, x, y);
+ cairo_paint(cr);
+ cairo_destroy(cr);
+
+ g_object_unref(pixbuf);
+ }
+ g_object_unref(icon_info);
+}
+
+static void
+reload_thumbnails(FivBrowser *self)
+{
+ GThreadPool *pool = g_thread_pool_new(
+ entry_add_thumbnail, self, g_get_num_processors(), FALSE, NULL);
+ for (guint i = 0; i < self->entries->len; i++)
+ g_thread_pool_push(pool, &g_array_index(self->entries, Entry, i), NULL);
+ g_thread_pool_free(pool, FALSE, TRUE);
+
+ for (guint i = 0; i < self->entries->len; i++)
+ materialize_icon(self, &g_array_index(self->entries, Entry, i));
+
+ gtk_widget_queue_resize(GTK_WIDGET(self));
+}
+
+// --- Context menu-------------------------------------------------------------
+
+typedef struct _OpenContext {
+ GWeakRef widget;
+ GFile *file;
+ char *content_type;
+ GAppInfo *app_info;
+} OpenContext;
+
+static void
+open_context_notify(gpointer data, G_GNUC_UNUSED GClosure *closure)
+{
+ OpenContext *self = data;
+ g_weak_ref_clear(&self->widget);
+ g_clear_object(&self->app_info);
+ g_clear_object(&self->file);
+ g_free(self->content_type);
+ g_free(self);
+}
+
+static void
+open_context_launch(GtkWidget *widget, OpenContext *self)
+{
+ GdkAppLaunchContext *context =
+ gdk_display_get_app_launch_context(gtk_widget_get_display(widget));
+ gdk_app_launch_context_set_screen(context, gtk_widget_get_screen(widget));
+ gdk_app_launch_context_set_timestamp(context, gtk_get_current_event_time());
+
+ // TODO(p): Display errors.
+ GList *files = g_list_append(NULL, self->file);
+ if (g_app_info_launch(
+ self->app_info, files, G_APP_LAUNCH_CONTEXT(context), NULL)) {
+ g_app_info_set_as_last_used_for_type(
+ self->app_info, self->content_type, NULL);
+ }
+ g_list_free(files);
+ g_object_unref(context);
+}
+
+static void
+append_opener(GtkWidget *menu, GAppInfo *opener, const OpenContext *template)
+{
+ OpenContext *ctx = g_malloc0(sizeof *ctx);
+ g_weak_ref_init(&ctx->widget, NULL);
+ ctx->file = g_object_ref(template->file);
+ ctx->content_type = g_strdup(template->content_type);
+ ctx->app_info = opener;
+
+ // It's documented that we can touch the child, if we want formatting:
+ // https://docs.gtk.org/gtk3/class.MenuItem.html
+ // XXX: Would g_app_info_get_display_name() be any better?
+ gchar *name = g_strdup_printf("Open With %s", g_app_info_get_name(opener));
+ GtkWidget *item = gtk_menu_item_new_with_label(name);
+ g_free(name);
+ g_signal_connect_data(item, "activate", G_CALLBACK(open_context_launch),
+ ctx, open_context_notify, 0);
+ gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
+}
+
+static void
+on_chooser_activate(GtkMenuItem *item, gpointer user_data)
+{
+ OpenContext *ctx = user_data;
+ GtkWindow *window = NULL;
+ GtkWidget *widget = g_weak_ref_get(&ctx->widget);
+ if (widget) {
+ if (GTK_IS_WINDOW((widget = gtk_widget_get_toplevel(widget))))
+ window = GTK_WINDOW(widget);
+ }
+
+ GtkWidget *dialog = gtk_app_chooser_dialog_new_for_content_type(window,
+ GTK_DIALOG_DESTROY_WITH_PARENT | GTK_DIALOG_MODAL, ctx->content_type);
+ if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_OK) {
+ ctx->app_info = gtk_app_chooser_get_app_info(GTK_APP_CHOOSER(dialog));
+ open_context_launch(GTK_WIDGET(item), ctx);
+ }
+ gtk_widget_destroy(dialog);
+}
+
+static gboolean
+destroy_widget_idle_source_func(GtkWidget *widget)
+{
+ // The whole menu is deactivated /before/ any item is activated,
+ // and a destroyed child item will not activate.
+ gtk_widget_destroy(widget);
+ return FALSE;
+}
+
+static void
+show_context_menu(GtkWidget *widget, const char *uri)
+{
+ GFile *file = g_file_new_for_uri(uri);
+ GFileInfo *info = g_file_query_info(file,
+ G_FILE_ATTRIBUTE_STANDARD_NAME
+ "," G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+ G_FILE_QUERY_INFO_NONE, NULL, NULL);
+ if (!info) {
+ g_object_unref(file);
+ return;
+ }
+
+ // This will have no application pre-assigned, for use with GTK+'s dialog.
+ OpenContext *ctx = g_malloc0(sizeof *ctx);
+ g_weak_ref_init(&ctx->widget, widget);
+ ctx->file = file;
+ ctx->content_type = g_strdup(g_file_info_get_content_type(info));
+ g_object_unref(info);
+
+ GAppInfo *default_ =
+ g_app_info_get_default_for_type(ctx->content_type, FALSE);
+ GList *recommended = g_app_info_get_recommended_for_type(ctx->content_type);
+ GList *fallback = g_app_info_get_fallback_for_type(ctx->content_type);
+
+ GtkWidget *menu = gtk_menu_new();
+ if (default_) {
+ append_opener(menu, default_, ctx);
+ gtk_menu_shell_append(
+ GTK_MENU_SHELL(menu), gtk_separator_menu_item_new());
+ }
+
+ for (GList *iter = recommended; iter; iter = iter->next) {
+ if (g_app_info_should_show(iter->data) &&
+ (!default_ || !g_app_info_equal(iter->data, default_)))
+ append_opener(menu, iter->data, ctx);
+ else
+ g_object_unref(iter->data);
+ }
+ if (recommended) {
+ g_list_free(recommended);
+ gtk_menu_shell_append(
+ GTK_MENU_SHELL(menu), gtk_separator_menu_item_new());
+ }
+
+ for (GList *iter = fallback; iter; iter = iter->next) {
+ if (g_app_info_should_show(iter->data) &&
+ (!default_ || !g_app_info_equal(iter->data, default_)))
+ append_opener(menu, iter->data, ctx);
+ else
+ g_object_unref(iter->data);
+ }
+ if (fallback) {
+ g_list_free(fallback);
+ gtk_menu_shell_append(
+ GTK_MENU_SHELL(menu), gtk_separator_menu_item_new());
+ }
+
+ GtkWidget *item = gtk_menu_item_new_with_label("Open With...");
+ g_signal_connect_data(item, "activate", G_CALLBACK(on_chooser_activate),
+ ctx, open_context_notify, 0);
+ gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
+
+ // As per GTK+ 3 Common Questions, 1.5.
+ g_object_ref_sink(menu);
+ g_signal_connect_swapped(menu, "deactivate",
+ G_CALLBACK(g_idle_add), destroy_widget_idle_source_func);
+ g_signal_connect(menu, "destroy", G_CALLBACK(g_object_unref), NULL);
+
+ gtk_widget_show_all(menu);
+ gtk_menu_popup_at_pointer(GTK_MENU(menu), NULL);
+}
+
+// --- Boilerplate -------------------------------------------------------------
+
+// TODO(p): For proper navigation, we need to implement GtkScrollable.
+G_DEFINE_TYPE_EXTENDED(FivBrowser, fiv_browser, GTK_TYPE_WIDGET, 0,
+ /* G_IMPLEMENT_INTERFACE(GTK_TYPE_SCROLLABLE,
+ fiv_browser_scrollable_init) */)
+
+enum {
+ PROP_THUMBNAIL_SIZE = 1,
+ N_PROPERTIES
+};
+
+static GParamSpec *browser_properties[N_PROPERTIES];
+
+enum {
+ ITEM_ACTIVATED,
+ LAST_SIGNAL,
+};
+
+// Globals are, sadly, the canonical way of storing signal numbers.
+static guint browser_signals[LAST_SIGNAL];
+
+static void
+fiv_browser_finalize(GObject *gobject)
+{
+ FivBrowser *self = FIV_BROWSER(gobject);
+ g_array_free(self->entries, TRUE);
+ g_array_free(self->layouted_rows, TRUE);
+ cairo_surface_destroy(self->glow);
+ g_clear_object(&self->pointer);
+
+ G_OBJECT_CLASS(fiv_browser_parent_class)->finalize(gobject);
+}
+
+static void
+fiv_browser_get_property(
+ GObject *object, guint property_id, GValue *value, GParamSpec *pspec)
+{
+ FivBrowser *self = FIV_BROWSER(object);
+ switch (property_id) {
+ case PROP_THUMBNAIL_SIZE:
+ g_value_set_enum(value, self->item_size);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
+ }
+}
+
+static void
+set_item_size(FivBrowser *self, FivIoThumbnailSize size)
+{
+ if (size < FIV_IO_THUMBNAIL_SIZE_MIN || size > FIV_IO_THUMBNAIL_SIZE_MAX)
+ return;
+
+ if (size != self->item_size) {
+ self->item_size = size;
+ self->item_height = fiv_io_thumbnail_sizes[self->item_size].size;
+ reload_thumbnails(self);
+
+ g_object_notify_by_pspec(
+ G_OBJECT(self), browser_properties[PROP_THUMBNAIL_SIZE]);
+ }
+}
+
+static void
+fiv_browser_set_property(
+ GObject *object, guint property_id, const GValue *value, GParamSpec *pspec)
+{
+ FivBrowser *self = FIV_BROWSER(object);
+ switch (property_id) {
+ case PROP_THUMBNAIL_SIZE:
+ set_item_size(self, g_value_get_enum(value));
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
+ }
+}
+
+static GtkSizeRequestMode
+fiv_browser_get_request_mode(G_GNUC_UNUSED GtkWidget *widget)
+{
+ return GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
+}
+
+static void
+fiv_browser_get_preferred_width(GtkWidget *widget, gint *minimum, gint *natural)
+{
+ FivBrowser *self = FIV_BROWSER(widget);
+ GtkStyleContext *style = gtk_widget_get_style_context(widget);
+
+ GtkBorder padding = {};
+ gtk_style_context_get_padding(style, GTK_STATE_FLAG_NORMAL, &padding);
+ *minimum = *natural = g_permitted_width_multiplier * self->item_height +
+ padding.left + 2 * self->item_border_x + padding.right;
+}
+
+static void
+fiv_browser_get_preferred_height_for_width(
+ GtkWidget *widget, gint width, gint *minimum, gint *natural)
+{
+ // XXX: This is rather ugly, the caller is only asking.
+ *minimum = *natural = relayout(FIV_BROWSER(widget), width);
+}
+
+static void
+fiv_browser_realize(GtkWidget *widget)
+{
+ GtkAllocation allocation;
+ gtk_widget_get_allocation(widget, &allocation);
+
+ GdkWindowAttr attributes = {
+ .window_type = GDK_WINDOW_CHILD,
+ .x = allocation.x,
+ .y = allocation.y,
+ .width = allocation.width,
+ .height = allocation.height,
+
+ // Input-only would presumably also work (as in GtkPathBar, e.g.),
+ // but it merely seems to involve more work.
+ .wclass = GDK_INPUT_OUTPUT,
+
+ .visual = gtk_widget_get_visual(widget),
+ .event_mask = gtk_widget_get_events(widget) | GDK_KEY_PRESS_MASK |
+ GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK | GDK_SCROLL_MASK,
+ };
+
+ // We need this window to receive input events at all.
+ // TODO(p): See if input events bubble up to parents.
+ GdkWindow *window = gdk_window_new(gtk_widget_get_parent_window(widget),
+ &attributes, GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL);
+ gtk_widget_register_window(widget, window);
+ gtk_widget_set_window(widget, window);
+ gtk_widget_set_realized(widget, TRUE);
+
+ FivBrowser *self = FIV_BROWSER(widget);
+ g_clear_object(&self->pointer);
+ self->pointer =
+ gdk_cursor_new_from_name(gdk_window_get_display(window), "pointer");
+}
+
+static void
+fiv_browser_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
+{
+ GTK_WIDGET_CLASS(fiv_browser_parent_class)
+ ->size_allocate(widget, allocation);
+
+ relayout(FIV_BROWSER(widget), allocation->width);
+}
+
+static gboolean
+fiv_browser_draw(GtkWidget *widget, cairo_t *cr)
+{
+ FivBrowser *self = FIV_BROWSER(widget);
+ if (!gtk_cairo_should_draw_window(cr, gtk_widget_get_window(widget)))
+ return TRUE;
+
+ GtkAllocation allocation;
+ gtk_widget_get_allocation(widget, &allocation);
+ gtk_render_background(gtk_widget_get_style_context(widget), cr, 0, 0,
+ allocation.width, allocation.height);
+
+ GdkRectangle clip = {};
+ gboolean have_clip = gdk_cairo_get_clip_rectangle(cr, &clip);
+
+ for (guint i = 0; i < self->layouted_rows->len; i++) {
+ const Row *row = &g_array_index(self->layouted_rows, Row, i);
+ GdkRectangle extents = {
+ .x = 0,
+ .y = row->y_offset - self->item_border_y,
+ .width = allocation.width,
+ .height = self->item_height + 2 * self->item_border_y,
+ };
+ if (!have_clip || gdk_rectangle_intersect(&clip, &extents, NULL))
+ draw_row(self, cr, row);
+ }
+ return TRUE;
+}
+
+static gboolean
+open_entry(GtkWidget *self, const Entry *entry, gboolean new_window)
+{
+ GFile *location = g_file_new_for_uri(entry->uri);
+ g_signal_emit(self, browser_signals[ITEM_ACTIVATED], 0, location,
+ new_window ? GTK_PLACES_OPEN_NEW_WINDOW : GTK_PLACES_OPEN_NORMAL);
+ g_object_unref(location);
+ return TRUE;
+}
+
+static gboolean
+fiv_browser_button_press_event(GtkWidget *widget, GdkEventButton *event)
+{
+ GTK_WIDGET_CLASS(fiv_browser_parent_class)
+ ->button_press_event(widget, event);
+
+ FivBrowser *self = FIV_BROWSER(widget);
+ if (event->type != GDK_BUTTON_PRESS)
+ return FALSE;
+
+ guint state = event->state & gtk_accelerator_get_default_mod_mask();
+ if (event->button == GDK_BUTTON_PRIMARY && state == 0 &&
+ gtk_widget_get_focus_on_click(widget))
+ gtk_widget_grab_focus(widget);
+
+ const Entry *entry = entry_at(self, event->x, event->y);
+ if (!entry)
+ return FALSE;
+
+ switch (event->button) {
+ case GDK_BUTTON_PRIMARY:
+ if (state == 0)
+ return open_entry(widget, entry, FALSE);
+ if (state == GDK_CONTROL_MASK)
+ return open_entry(widget, entry, TRUE);
+ return FALSE;
+ case GDK_BUTTON_MIDDLE:
+ if (state == 0)
+ return open_entry(widget, entry, TRUE);
+ return FALSE;
+ case GDK_BUTTON_SECONDARY:
+ // On X11, after closing the menu, the pointer otherwise remains,
+ // no matter what its new location is.
+ gdk_window_set_cursor(gtk_widget_get_window(widget), NULL);
+ show_context_menu(widget, entry->uri);
+ return TRUE;
+ default:
+ return FALSE;
+ }
+}
+
+gboolean
+fiv_browser_motion_notify_event(GtkWidget *widget, GdkEventMotion *event)
+{
+ GTK_WIDGET_CLASS(fiv_browser_parent_class)
+ ->motion_notify_event(widget, event);
+
+ FivBrowser *self = FIV_BROWSER(widget);
+ if (event->state != 0)
+ return FALSE;
+
+ const Entry *entry = entry_at(self, event->x, event->y);
+ GdkWindow *window = gtk_widget_get_window(widget);
+ gdk_window_set_cursor(window, entry ? self->pointer : NULL);
+ return TRUE;
+}
+
+static gboolean
+fiv_browser_scroll_event(GtkWidget *widget, GdkEventScroll *event)
+{
+ FivBrowser *self = FIV_BROWSER(widget);
+ if ((event->state & gtk_accelerator_get_default_mod_mask()) !=
+ GDK_CONTROL_MASK)
+ return FALSE;
+
+ switch (event->direction) {
+ case GDK_SCROLL_UP:
+ set_item_size(self, self->item_size + 1);
+ return TRUE;
+ case GDK_SCROLL_DOWN:
+ set_item_size(self, self->item_size - 1);
+ return TRUE;
+ default:
+ // For some reason, we can also get GDK_SCROLL_SMOOTH.
+ // Left/right are good to steal from GtkScrolledWindow for consistency.
+ return TRUE;
+ }
+}
+
+static gboolean
+fiv_browser_query_tooltip(GtkWidget *widget, gint x, gint y,
+ G_GNUC_UNUSED gboolean keyboard_tooltip, GtkTooltip *tooltip)
+{
+ FivBrowser *self = FIV_BROWSER(widget);
+ const Entry *entry = entry_at(self, x, y);
+ if (!entry)
+ return FALSE;
+
+ GFile *file = g_file_new_for_uri(entry->uri);
+ GFileInfo *info = g_file_query_info(file,
+ G_FILE_ATTRIBUTE_STANDARD_NAME
+ "," G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME,
+ G_FILE_QUERY_INFO_NONE, NULL, NULL);
+ g_object_unref(file);
+ if (!info)
+ return FALSE;
+
+ gtk_tooltip_set_text(tooltip, g_file_info_get_display_name(info));
+ g_object_unref(info);
+ return TRUE;
+}
+
+static void
+fiv_browser_style_updated(GtkWidget *widget)
+{
+ GTK_WIDGET_CLASS(fiv_browser_parent_class)->style_updated(widget);
+
+ FivBrowser *self = FIV_BROWSER(widget);
+ GtkStyleContext *style = gtk_widget_get_style_context(widget);
+ GtkBorder border = {}, margin = {};
+
+ int item_spacing = self->item_spacing;
+ gtk_widget_style_get(widget, "spacing", &self->item_spacing, NULL);
+ if (item_spacing != self->item_spacing)
+ gtk_widget_queue_resize(widget);
+
+ // Using a pseudo-class, because GTK+ regions are deprecated.
+ gtk_style_context_save(style);
+ gtk_style_context_add_class(style, "item");
+ gtk_style_context_get_margin(style, GTK_STATE_FLAG_NORMAL, &margin);
+ gtk_style_context_get_border(style, GTK_STATE_FLAG_NORMAL, &border);
+ gtk_style_context_restore(style);
+
+ const int glow_w = (margin.left + margin.right) / 2;
+ const int glow_h = (margin.top + margin.bottom) / 2;
+
+ // Don't set different opposing sides, it will misrender, your problem.
+ // When the style of the class changes, this virtual method isn't invoked,
+ // so the update check is mildly pointless.
+ int item_border_x = glow_w + (border.left + border.right) / 2;
+ int item_border_y = glow_h + (border.top + border.bottom) / 2;
+ if (item_border_x != self->item_border_x ||
+ item_border_y != self->item_border_y) {
+ self->item_border_x = item_border_x;
+ self->item_border_y = item_border_y;
+ gtk_widget_queue_resize(widget);
+ }
+
+ if (self->glow)
+ cairo_surface_destroy(self->glow);
+ if (glow_w <= 0 || glow_h <= 0) {
+ self->glow = cairo_image_surface_create(CAIRO_FORMAT_A1, 0, 0);
+ return;
+ }
+
+ self->glow = cairo_image_surface_create(CAIRO_FORMAT_A8, glow_w, glow_h);
+ unsigned char *data = cairo_image_surface_get_data(self->glow);
+ int stride = cairo_image_surface_get_stride(self->glow);
+
+ // Smooth out the curve, so that the edge of the glow isn't too jarring.
+ const double fade_factor = 1.5;
+
+ const int x_max = glow_w - 1;
+ const int y_max = glow_h - 1;
+ const double x_scale = 1. / MAX(1, x_max);
+ const double y_scale = 1. / MAX(1, y_max);
+ for (int y = 0; y <= y_max; y++)
+ for (int x = 0; x <= x_max; x++) {
+ const double xn = x_scale * (x_max - x);
+ const double yn = y_scale * (y_max - y);
+ double v = MIN(sqrt(xn * xn + yn * yn), 1);
+ data[y * stride + x] = round(pow(1 - v, fade_factor) * 255);
+ }
+ cairo_surface_mark_dirty(self->glow);
+}
+
+static void
+fiv_browser_class_init(FivBrowserClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS(klass);
+ object_class->finalize = fiv_browser_finalize;
+ object_class->get_property = fiv_browser_get_property;
+ object_class->set_property = fiv_browser_set_property;
+
+ browser_properties[PROP_THUMBNAIL_SIZE] = g_param_spec_enum(
+ "thumbnail-size", "Thumbnail size", "The thumbnail height to use",
+ FIV_TYPE_IO_THUMBNAIL_SIZE, FIV_IO_THUMBNAIL_SIZE_NORMAL,
+ G_PARAM_READWRITE);
+ g_object_class_install_properties(
+ object_class, N_PROPERTIES, browser_properties);
+
+ browser_signals[ITEM_ACTIVATED] = g_signal_new("item-activated",
+ G_TYPE_FROM_CLASS(klass), 0, 0, NULL, NULL, NULL,
+ G_TYPE_NONE, 2, G_TYPE_FILE, GTK_TYPE_PLACES_OPEN_FLAGS);
+
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+ widget_class->get_request_mode = fiv_browser_get_request_mode;
+ widget_class->get_preferred_width = fiv_browser_get_preferred_width;
+ widget_class->get_preferred_height_for_width =
+ fiv_browser_get_preferred_height_for_width;
+ widget_class->realize = fiv_browser_realize;
+ widget_class->draw = fiv_browser_draw;
+ widget_class->size_allocate = fiv_browser_size_allocate;
+ widget_class->button_press_event = fiv_browser_button_press_event;
+ widget_class->motion_notify_event = fiv_browser_motion_notify_event;
+ widget_class->scroll_event = fiv_browser_scroll_event;
+ widget_class->query_tooltip = fiv_browser_query_tooltip;
+ widget_class->style_updated = fiv_browser_style_updated;
+
+ // Could be split to also-idiomatic row-spacing/column-spacing properties.
+ // The GParamSpec is sinked by this call.
+ gtk_widget_class_install_style_property(widget_class,
+ g_param_spec_int("spacing", "Spacing", "Space between items",
+ 0, G_MAXINT, 1, G_PARAM_READWRITE));
+
+ // TODO(p): Later override "screen_changed", recreate Pango layouts there,
+ // if we get to have any, or otherwise reflect DPI changes.
+ gtk_widget_class_set_css_name(widget_class, "fiv-browser");
+}
+
+static void
+fiv_browser_init(FivBrowser *self)
+{
+ gtk_widget_set_can_focus(GTK_WIDGET(self), TRUE);
+ gtk_widget_set_has_tooltip(GTK_WIDGET(self), TRUE);
+
+ self->entries = g_array_new(FALSE, TRUE, sizeof(Entry));
+ g_array_set_clear_func(self->entries, (GDestroyNotify) entry_free);
+ self->layouted_rows = g_array_new(FALSE, TRUE, sizeof(Row));
+ g_array_set_clear_func(self->layouted_rows, (GDestroyNotify) row_free);
+
+ set_item_size(self, FIV_IO_THUMBNAIL_SIZE_NORMAL);
+ self->selected = -1;
+ self->glow = cairo_image_surface_create(CAIRO_FORMAT_A1, 0, 0);
+
+ g_signal_connect_swapped(gtk_settings_get_default(),
+ "notify::gtk-icon-theme-name", G_CALLBACK(reload_thumbnails), self);
+}
+
+// --- Public interface --------------------------------------------------------
+
+static gint
+entry_compare(gconstpointer a, gconstpointer b)
+{
+ const Entry *entry1 = a;
+ const Entry *entry2 = b;
+ GFile *location1 = g_file_new_for_uri(entry1->uri);
+ GFile *location2 = g_file_new_for_uri(entry2->uri);
+ gint result = fiv_io_filecmp(location1, location2);
+ g_object_unref(location1);
+ g_object_unref(location2);
+ return result;
+}
+
+void
+fiv_browser_load(
+ FivBrowser *self, FivBrowserFilterCallback cb, const char *path)
+{
+ g_array_set_size(self->entries, 0);
+ g_array_set_size(self->layouted_rows, 0);
+
+ GFile *file = g_file_new_for_path(path);
+ GFileEnumerator *enumerator = g_file_enumerate_children(file,
+ G_FILE_ATTRIBUTE_STANDARD_NAME "," G_FILE_ATTRIBUTE_STANDARD_TYPE,
+ G_FILE_QUERY_INFO_NONE, NULL, NULL);
+ g_object_unref(file);
+ if (!enumerator)
+ return;
+
+ while (TRUE) {
+ GFileInfo *info = NULL;
+ GFile *child = NULL;
+ if (!g_file_enumerator_iterate(enumerator, &info, &child, NULL, NULL) ||
+ !info)
+ break;
+ if (g_file_info_get_file_type(info) == G_FILE_TYPE_DIRECTORY)
+ continue;
+ if (cb && !cb(g_file_info_get_name(info)))
+ continue;
+
+ g_array_append_val(self->entries,
+ ((Entry) {.thumbnail = NULL, .uri = g_file_get_uri(child)}));
+ }
+ g_object_unref(enumerator);
+
+ // TODO(p): Support being passed a sort function.
+ g_array_sort(self->entries, entry_compare);
+
+ reload_thumbnails(self);
+}