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-rw-r--r--fastiv-browser.c233
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+//
+// fastiv-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 "fastiv-browser.h"
+#include "fastiv-view.h"
+
+typedef struct entry Entry;
+
+struct entry {
+ char *filename;
+ cairo_surface_t *thumbnail;
+};
+
+static void
+entry_free(Entry *self)
+{
+ g_free(self->filename);
+ if (self->thumbnail)
+ cairo_surface_destroy(self->thumbnail);
+}
+
+// --- Boilerplate -------------------------------------------------------------
+
+struct _FastivBrowser {
+ GtkWidget parent_instance;
+
+ // TODO(p): We probably want to pre-arrange everything into rows.
+ // - All rows are the same height.
+ GArray *entries;
+ int selected;
+};
+
+// TODO(p): For proper navigation, we need to implement GtkScrollable.
+G_DEFINE_TYPE_EXTENDED(FastivBrowser, fastiv_browser, GTK_TYPE_WIDGET, 0,
+ /* G_IMPLEMENT_INTERFACE(GTK_TYPE_SCROLLABLE,
+ fastiv_browser_scrollable_init) */)
+
+enum {
+ ITEM_ACTIVATED,
+ LAST_SIGNAL,
+};
+
+// Globals are, sadly, the canonical way of storing signal numbers.
+static guint browser_signals[LAST_SIGNAL];
+
+static void
+fastiv_browser_finalize(GObject *gobject)
+{
+ G_GNUC_UNUSED FastivBrowser *self = FASTIV_BROWSER(gobject);
+ G_OBJECT_CLASS(fastiv_browser_parent_class)->finalize(gobject);
+}
+
+static GtkSizeRequestMode
+fastiv_browser_get_request_mode(G_GNUC_UNUSED GtkWidget *widget)
+{
+ return GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
+}
+
+static void
+fastiv_browser_get_preferred_width(GtkWidget *widget,
+ gint *minimum, gint *natural)
+{
+ G_GNUC_UNUSED FastivBrowser *self = FASTIV_BROWSER(widget);
+ // TODO(p): Set it to the width of the widget with one wide item within.
+ *minimum = *natural = 0;
+}
+
+static void
+fastiv_browser_get_preferred_height_for_width(GtkWidget *widget,
+ G_GNUC_UNUSED gint width, gint *minimum, gint *natural)
+{
+ G_GNUC_UNUSED FastivBrowser *self = FASTIV_BROWSER(widget);
+ // TODO(p): Re-layout, figure it out.
+ *minimum = *natural = 0;
+}
+
+static void
+fastiv_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_BUTTON_PRESS_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);
+}
+
+static gboolean
+fastiv_browser_draw(GtkWidget *widget, cairo_t *cr)
+{
+ G_GNUC_UNUSED FastivBrowser *self = FASTIV_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);
+
+ const double row_height = 256;
+
+ gint occupied_width = 0, y = 0;
+ 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);
+ int height = cairo_image_surface_get_height(entry->thumbnail);
+
+ double scale = row_height / height;
+ if (width * scale > 2 * row_height)
+ scale = 2 * row_height / width;
+
+ int projected_width = round(scale * width);
+ int projected_height = round(scale * height);
+
+ if (occupied_width != 0
+ && occupied_width + projected_width > allocation.width) {
+ occupied_width = 0;
+ y += row_height;
+ }
+
+ cairo_save(cr);
+ cairo_translate(cr, occupied_width, y + row_height - projected_height);
+ cairo_scale(cr, scale, scale);
+ cairo_set_source_surface(cr, entry->thumbnail, 0, 0);
+ cairo_paint(cr);
+ cairo_restore(cr);
+
+ occupied_width += projected_width;
+ }
+ return TRUE;
+}
+
+static void
+fastiv_browser_class_init(FastivBrowserClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS(klass);
+ object_class->finalize = fastiv_browser_finalize;
+
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+ widget_class->get_request_mode = fastiv_browser_get_request_mode;
+ widget_class->get_preferred_width =
+ fastiv_browser_get_preferred_width;
+ widget_class->get_preferred_height_for_width =
+ fastiv_browser_get_preferred_height_for_width;
+ widget_class->realize = fastiv_browser_realize;
+ widget_class->draw = fastiv_browser_draw;
+
+ // TODO(p): Connect to this and emit it.
+ browser_signals[ITEM_ACTIVATED] =
+ g_signal_new("item-activated", G_TYPE_FROM_CLASS(klass),
+ 0, 0, NULL, NULL, NULL, G_TYPE_NONE, 0);
+
+ // 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, "fastiv-browser");
+}
+
+static void
+fastiv_browser_init(FastivBrowser *self)
+{
+ gtk_widget_set_can_focus(GTK_WIDGET(self), TRUE);
+
+ self->entries = g_array_new(FALSE, TRUE, sizeof(Entry));
+ g_array_set_clear_func(self->entries, (GDestroyNotify) entry_free);
+ self->selected = -1;
+}
+
+void
+fastiv_browser_load(FastivBrowser *self, const char *path)
+{
+ g_array_set_size(self->entries, 0);
+
+ // TODO(p): Use opendir(), in order to get file type directly.
+ GDir *dir = g_dir_open(path, 0, NULL);
+ if (!dir)
+ return;
+
+ const char *filename;
+ while ((filename = g_dir_read_name(dir))) {
+ if (!strcmp(filename, ".")
+ || !strcmp(filename, ".."))
+ continue;
+
+ gchar *subpath = g_build_filename(path, filename, NULL);
+ g_array_append_val(self->entries, ((Entry) {
+ .thumbnail = fastiv_io_lookup_thumbnail(subpath),
+ .filename = subpath,
+ }));
+ }
+ g_dir_close(dir);
+
+ // TODO(p): Sort the entries.
+ gtk_widget_queue_draw(GTK_WIDGET(self));
+}