fiv/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
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int item_height; ///< Thumbnail height in pixels
int item_spacing; ///< Space between items in pixels
GArray *entries; ///< [Entry]
GArray *layouted_rows; ///< [Row]
int selected;
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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 {
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char *uri; ///< GIO URI
cairo_surface_t *thumbnail; ///< Prescaled thumbnail
GIcon *icon; ///< If no thumbnail, use this icon
};
static void
entry_free(Entry *self)
{
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g_free(self->uri);
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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.
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*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);
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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,
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.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;
}
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static void
draw_row(FivBrowser *self, cairo_t *cr, const Row *row)
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{
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);
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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);
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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);
}
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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);
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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);
}
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cairo_restore(cr);
gtk_style_context_restore(style);
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}
gtk_style_context_restore(style);
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}
// --- 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);
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g_clear_pointer(&self->thumbnail, cairo_surface_destroy);
FivBrowser *browser = FIV_BROWSER(user_data);
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GFile *file = g_file_new_for_uri(self->uri);
self->thumbnail = rescale_thumbnail(
fiv_io_lookup_thumbnail(file, browser->item_size),
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browser->item_height);
if (self->thumbnail)
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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);
}
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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(
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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) {
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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
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show_context_menu(GtkWidget *widget, const char *uri)
{
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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);
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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,
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.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.
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.wclass = GDK_INPUT_OUTPUT,
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.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);
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FivBrowser *self = FIV_BROWSER(widget);
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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);
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gtk_render_background(gtk_widget_get_style_context(widget), cr, 0, 0,
allocation.width, allocation.height);
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GdkRectangle clip = {};
gboolean have_clip = gdk_cairo_get_clip_rectangle(cr, &clip);
for (guint i = 0; i < self->layouted_rows->len; i++) {
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const Row *row = &g_array_index(self->layouted_rows, Row, i);
GdkRectangle extents = {
.x = 0,
.y = row->y_offset - self->item_border_y,
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.width = allocation.width,
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.height = self->item_height + 2 * self->item_border_y,
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};
if (!have_clip || gdk_rectangle_intersect(&clip, &extents, NULL))
draw_row(self, cr, row);
}
return TRUE;
}
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static gboolean
open_entry(GtkWidget *self, const Entry *entry, gboolean new_window)
{
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GFile *location = g_file_new_for_uri(entry->uri);
g_signal_emit(self, browser_signals[ITEM_ACTIVATED], 0, location,
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new_window ? GTK_PLACES_OPEN_NEW_WINDOW : GTK_PLACES_OPEN_NORMAL);
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g_object_unref(location);
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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);
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if (event->type != GDK_BUTTON_PRESS)
return FALSE;
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guint state = event->state & gtk_accelerator_get_default_mod_mask();
if (event->button == GDK_BUTTON_PRIMARY && state == 0 &&
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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) {
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case GDK_BUTTON_PRIMARY:
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if (state == 0)
return open_entry(widget, entry, FALSE);
if (state == GDK_CONTROL_MASK)
return open_entry(widget, entry, TRUE);
return FALSE;
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case GDK_BUTTON_MIDDLE:
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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);
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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);
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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;
}
}
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static gboolean
fiv_browser_query_tooltip(GtkWidget *widget, gint x, gint y,
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G_GNUC_UNUSED gboolean keyboard_tooltip, GtkTooltip *tooltip)
{
FivBrowser *self = FIV_BROWSER(widget);
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const Entry *entry = entry_at(self, x, y);
if (!entry)
return FALSE;
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GFile *file = g_file_new_for_uri(entry->uri);
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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,
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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);
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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 --------------------------------------------------------
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static gint
entry_compare(gconstpointer a, gconstpointer b)
{
const Entry *entry1 = a;
const Entry *entry2 = b;
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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);
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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);
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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;
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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;
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g_array_append_val(self->entries,
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((Entry) {.thumbnail = NULL, .uri = g_file_get_uri(child)}));
}
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g_object_unref(enumerator);
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// TODO(p): Support being passed a sort function.
g_array_sort(self->entries, entry_compare);
reload_thumbnails(self);
}