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drop-zone: Fixes and improvements to Vala code #99

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Mar 1, 2024
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drop-zone: Fixes and improvements to Vala code #99

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143 changes: 67 additions & 76 deletions demos/Drop Zone/main.vala
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Original file line number Diff line number Diff line change
@@ -1,130 +1,121 @@
#! /usr/bin/env -S vala workbench.vala --pkg gtk4 --pkg libadwaita-1 --pkg gio-2.0 --pkg gobject-2.0
#! /usr/bin/env -S vala workbench.vala --pkg libadwaita-1

using Gtk;
using GLib;
using Gdk;
using Adw;

void main() {
Adw.Bin bin = workbench.builder.get_object("bin") as Adw.Bin;
public void main () {
var bin = (Adw.Bin) workbench.builder.get_object ("bin");

// Universal drop target for any String data
var string_drop_target = new DropTarget(GLib.Type.STRING, Gdk.DragAction.COPY);
bin.add_controller(string_drop_target);
var string_drop_target = new Gtk.DropTarget (Type.STRING, COPY);
bin.add_controller (string_drop_target);

string_drop_target.drop.connect((self, value, x, y) => {
bin.child = createTextPreview(value.get_string());
bin.remove_css_class("overlay-drag-area");
string_drop_target.drop.connect ((value, x, y) => {
bin.child = create_text_preview (value.get_string ());
bin.remove_css_class ("overlay-drag-area");
return true;
});

// Drop Target for Files
var file_drop_target = new DropTarget(typeof (GLib.File), Gdk.DragAction.COPY);
bin.add_controller(file_drop_target);

file_drop_target.drop.connect((self, value, x, y) => {
File file = value.get_object() as GLib.File;
var file_drop_target = new Gtk.DropTarget (typeof (File), COPY);
bin.add_controller (file_drop_target);

if (!(file is GLib.File))
return false;
file_drop_target.drop.connect ((value, x, y) => {
var file = (File) value;

try {
var file_info = file.query_info("standard::content-type", 0, null);
string content_type = file_info.get_content_type();
if (content_type.has_prefix("image/")) {
bin.child = createImagePreview(file);
} else if (content_type.has_prefix("video/")) {
bin.child = createVideoPreview(file);
var file_info = file.query_info ("standard::content-type", 0, null);
string content_type = file_info.get_content_type ();
if (content_type.has_prefix ("image/")) {
bin.child = create_image_preview (file);
} else if (content_type.has_prefix ("video/")) {
bin.child = create_video_preview (file);
} else {
bin.child = createFilePreview(file);
bin.child = create_file_preview (file);
}
} catch (GLib.Error e) {
message("Failed to retrieve file info: \"%s\"", e.message);
} catch (Error e) {
critical (@"Unable to load preview: \"$(e.message)\"");
}

bin.remove_css_class("overlay-drag-area");
bin.remove_css_class ("overlay-drag-area");
return true;
});

// Drop Hover Effect
file_drop_target.enter.connect(() => {
bin.add_css_class("overlay-drag-area");
return Gdk.DragAction.COPY;
file_drop_target.enter.connect (() => {
bin.add_css_class ("overlay-drag-area");
return COPY;
});

file_drop_target.leave.connect(() => {
bin.remove_css_class("overlay-drag-area");
return;
file_drop_target.leave.connect (() => {
bin.remove_css_class ("overlay-drag-area");
});

string_drop_target.enter.connect(() => {
bin.add_css_class("overlay-drag-area");
return Gdk.DragAction.COPY;
string_drop_target.enter.connect (() => {
bin.add_css_class ("overlay-drag-area");
return COPY;
});

string_drop_target.leave.connect(() => {
bin.remove_css_class("overlay-drag-area");
return;
string_drop_target.leave.connect (() => {
bin.remove_css_class ("overlay-drag-area");
});
}

private Widget createImagePreview(GLib.File file) {
var widget = createBoxWidget();
private Gtk.Widget create_image_preview (File file) {
var widget = create_box_widget ();

var picture = new Picture() {
file = file, can_shrink = true, content_fit = Gtk.ContentFit.SCALE_DOWN
var picture = new Gtk.Picture () {
file = file,
can_shrink = true,
content_fit = SCALE_DOWN
};
widget.append(picture);
widget.append (picture);

return widget;
}

private Widget createTextPreview(string text) {
var widget = createBoxWidget();
private Gtk.Widget create_text_preview (string text) {
var widget = create_box_widget ();

var label = new Label(text) {
var label = new Gtk.Label (text) {
wrap = true
};
widget.append(label);
widget.append (label);

return widget;
}

private Widget createVideoPreview(GLib.File file) {
var widget = createBoxWidget();
private Gtk.Widget create_video_preview (File file) {
var widget = create_box_widget ();

var video = new Video.for_file(file);
widget.append(video);
var video = new Gtk.Video.for_file (file);
widget.append (video);

return widget;
}

private Widget createFilePreview(GLib.File file) {
var widget = createBoxWidget();
private Gtk.Widget create_file_preview (File file) {
var widget = create_box_widget ();

try {
var file_info = file.query_info("standard::icon", 0, null);
var icon = new Image.from_gicon(file_info.get_icon());
widget.append(icon);
icon.icon_size = IconSize.LARGE;

var file_name = new Label(file.get_basename());
widget.append(file_name);
} catch (GLib.Error e) {
message("Failed to retrieve file icon: \"%s\"", e.message);
var file_info = file.query_info ("standard::icon", NONE, null);
var icon = new Gtk.Image.from_gicon (file_info.get_icon ());
widget.append (icon);
icon.icon_size = LARGE;

var file_name = new Gtk.Label (file.get_basename ());
widget.append (file_name);
} catch (Error e) {
critical (@"Failed to retrieve file icon: $(e.message)");
}

return widget;
}

private Box createBoxWidget() {
var widget = new Box(Orientation.VERTICAL, 6);
widget.halign = Align.CENTER;
widget.valign = Align.CENTER;
widget.margin_top = 12;
widget.margin_bottom = 12;
widget.margin_start = 12;
widget.margin_end = 12;

return widget;
private Gtk.Box create_box_widget () {
return new Gtk.Box (VERTICAL, 6) {
halign = CENTER,
valign = CENTER,
margin_top = 12,
margin_bottom = 12,
margin_start = 12,
margin_end = 12
};
}
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