我想使用gtk-rs bindings创建包含TreeView
个ComboBox
的程序。
为了获得GtkCellRendererCombo
的数据,我需要GtkTreeModel *
,但我不知道如何在ListStore
内添加ListStore
。
现在我只有一个简单的TreeView
。我想要一个ComboBox
里面的1列(标题" f64"):
extern crate gtk;
use gtk::prelude::*;
use gtk::{ComboBox, ListStore, Orientation, TreeView, TreeViewColumn, Window, WindowType};
fn main() {
gtk::init().expect("Failed to initialize GTK");
let window = Window::new(WindowType::Toplevel);
window.set_position(gtk::WindowPosition::Center);
window.set_title("Rust>K+3");
window.set_position(gtk::WindowPosition::Center);
window.connect_delete_event(|wind, _| {
let (szerokosc, wysokosc) = wind.get_size();
println!("Width {} Height {}", szerokosc, wysokosc);
// Stop the main loop.
gtk::main_quit();
// Let the default handler destroy the window.
Inhibit(false)
});
let main_box = gtk::Box::new(Orientation::Vertical, 0);
let view_list = TreeView::new();
{
let types_inside_columns = &[gtk::Type::U32, gtk::Type::F64];
let model_list_of_data = ListStore::new(types_inside_columns);
for liczba in 0..10 {
let array_of_data = [&(liczba.to_value()) as &ToValue,
&((liczba as f64 * 1.5).to_value()) as &ToValue];
model_list_of_data.insert_with_values(None, &[0, 1], &array_of_data);
}
view_list.set_model(Some(&model_list_of_data));
let object_to_render_cells: gtk::CellRendererText = gtk::CellRendererText::new();
object_to_render_cells.set_visible(true);
let view_column = TreeViewColumn::new();
view_column.set_expand(true);
view_column.set_visible(true);
view_column.set_title("u32");
view_column.pack_start(&object_to_render_cells, true);
view_column.add_attribute(&object_to_render_cells, "text", 0);
view_list.append_column(&view_column);
// second column
let object_to_render_cells_2: gtk::CellRendererText = gtk::CellRendererText::new();
object_to_render_cells_2.set_visible(true);
let view_column_2 = TreeViewColumn::new();
view_column_2.set_expand(true);
view_column_2.set_visible(true);
view_column_2.set_title("f64");
view_column_2.pack_start(&object_to_render_cells, true);
view_column_2.add_attribute(&object_to_render_cells, "text", 1);
view_list.append_column(&view_column_2);
}
view_list.expand_all();
main_box.add(&view_list);
window.add(&main_box);
window.show_all();
gtk::main();
}
我尝试将gtk::Type:BaseBoxed
添加到types_inside_columns
,然后将ListStore
添加到array_of_data
,但Box
无法通过方法{{}成功转换1}}输入to_value()
。
添加了: 这个程序在运行时很恐慌:
ToValue
答案 0 :(得分:2)
如果您想在另一个gtk::ListStore
中存储gtk::ListStore
,则不指定gtk::Type::Pointer
,您需要使用最后一个版本gtk::Type::Other(usize)
。您可以在运行时使用ToValue::to_value_type
获取gtk::ListStore
的类型。遗憾的是,在编译时找不到一种方法,因为类型号会改变。
let model = ListStore::new(&[Type::U8]);
println!("{:?}", model.to_value_type()); // Other(139977306752544)
println!("{:?}", model.to_value()); // Value(((GtkListStore*) 0x7f4f01b9a060))
// get type at runtime
let liststore_type = model.to_value_type();
let model = ListStore::new(&[Type::U32, Type::F64, liststore_type]);
现在,您可以根据需要插入子模型ToValue::to_value
。
gtk::CellRendererCombo
但是,您写道,您希望连续使用组合框,可能用于编辑数字。为此,您不需要嵌套gtk::ListStore
。您需要gtk::TreeView
的模型和选项的另一个模型。
let model_list_of_data = ListStore::new(&[gtk::Type::U32, gtk::Type::String]);
let model_for_combo = ListStore::new(&[gtk::Type::String]);
for liczba in 0..10 {
let integer = liczba.to_value();
let float = format!("{}", liczba as f64 * 1.5).to_value();
model_list_of_data.insert_with_values(None, &[0, 1], &[&integer, &float]);
model_for_combo.insert_with_values(None, &[0], &[&float]);
}
// code for first column not changed
let object_to_render_cells_2: gtk::CellRendererCombo = gtk::CellRendererCombo::new();
object_to_render_cells_2.set_visible(true);
object_to_render_cells_2.set_property_editable(true);
// use the combo model for the options
object_to_render_cells_2.set_property_model(Some(&model_for_combo.upcast()));
// display the options of the first column in the combo model
object_to_render_cells_2.set_property_text_column(0);
let view_column_2 = TreeViewColumn::new();
view_column_2.set_expand(true);
view_column_2.set_visible(true);
view_column_2.set_title("f64");
view_column_2.pack_start(&object_to_render_cells_2, false);
// the data for each row is in the second column in the tree model
view_column_2.add_attribute(&object_to_render_cells_2, "text", 1);
view_list.append_column(&view_column_2);
您可能已经注意到我使用了字符串而不是普通浮点数。这有两个原因: