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Diffstat (limited to 'fastiv-browser.c')
| -rw-r--r-- | fastiv-browser.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/fastiv-browser.c b/fastiv-browser.c new file mode 100644 index 0000000..883a8b2 --- /dev/null +++ b/fastiv-browser.c @@ -0,0 +1,233 @@ +// +// 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)); +} |