我试图通过销毁小部件从Gtk.FlowBox中删除Widget,但是有一个灰色框留在原位。任何想法如何删除灰色框,以便在删除小部件后相邻的小部件就位。
以下是小部件的打包方式: 1-两个图像(来自pixbuf)和Label被添加到OverlayImage中 2- Overlay Image添加到EventBox 3- EventBox被添加到FlowBox
我尝试过以下方法: 1-销毁EventBox 2-获取并销毁Overlay Image的所有子项,然后销毁OverLay Image和EventBox
在这两种情况下,窗口小部件都被删除了,但是一个空白区域保留在它的位置,点击时它是灰色的,但什么都不做 - 见图片。
如何删除此空白区域,以便下一个小部件自动落入移除小部件的位置,并使下一个小部件落入其位置等等。
这里有代码和" removeSelectedBooksFromLibrary"是从FlowBox中删除用户选择的EventBox的方法
这是从FlowBox添加小部件的代码 https://github.com/babluboy/bookworm/blob/master/src/bookworm.vala#L589
这是从FlowBox中删除小部件的代码 https://github.com/babluboy/bookworm/blob/master/src/bookworm.vala#L512
这是一个添加了解决方案的工作示例,它删除了小部件及其父级。
public class FlowBoxIssue : Gtk.Window {
public static int main (string[] args) {
Gtk.init (ref args);
FlowBoxIssue window = new FlowBoxIssue();
window.show_all ();
Gtk.main ();
return 0;
}
public FlowBoxIssue () {
this.title = "FlowBox Issue";
this.window_position = Gtk.WindowPosition.CENTER;
this.destroy.connect (Gtk.main_quit);
this.set_default_size (800, 600);
Gtk.FlowBox library_flowbox = new Gtk.FlowBox();
Gtk.Box library_mainbox = new Gtk.Box (Gtk.Orientation.VERTICAL, 20);
Gtk.ScrolledWindow library_scroll = new Gtk.ScrolledWindow (null, null);
library_scroll.set_policy (Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC);
library_scroll.add (library_flowbox);
Gtk.Overlay aOverlayImage1 = new Gtk.Overlay();
Gtk.EventBox aEventBox1 = new Gtk.EventBox();
Gtk.EventBox aEventBox2 = new Gtk.EventBox();
Gtk.EventBox aEventBox3 = new Gtk.EventBox();
try{
Gdk.Pixbuf aBookCover1 = new Gdk.Pixbuf.from_file_at_scale("cover.png", 200, 250, false);
Gtk.Image aCoverImage1 = new Gtk.Image.from_pixbuf(aBookCover1);
aOverlayImage1.add(aCoverImage1);
Gtk.Label overlayTextLabel1 = new Gtk.Label("Label 1");
aOverlayImage1.add_overlay(overlayTextLabel1);
aEventBox1.add(aOverlayImage1);
library_flowbox.add (aEventBox1);
}catch(Error e){
}
Gtk.Overlay aOverlayImage2 = new Gtk.Overlay();
try{
Gdk.Pixbuf aBookCover2 = new Gdk.Pixbuf.from_file_at_scale("cover.png", 200, 250, false);
Gtk.Image aCoverImage2 = new Gtk.Image.from_pixbuf(aBookCover2);
aOverlayImage2.add(aCoverImage2);
Gtk.Label overlayTextLabel2 = new Gtk.Label("Label 2");
aOverlayImage2.add_overlay(overlayTextLabel2);
aEventBox2.add(aOverlayImage2);
library_flowbox.add (aEventBox2);
}catch(Error e){
}
Gtk.Overlay aOverlayImage3 = new Gtk.Overlay();
try{
Gdk.Pixbuf aBookCover3 = new Gdk.Pixbuf.from_file_at_scale("cover.png", 200, 250, false);
Gtk.Image aCoverImage3 = new Gtk.Image.from_pixbuf(aBookCover3);
aOverlayImage3.add(aCoverImage3);
Gtk.Label overlayTextLabel3 = new Gtk.Label("Label 3");
aOverlayImage3.add_overlay(overlayTextLabel3);
aEventBox3.add(aOverlayImage3);
library_flowbox.add (aEventBox3);
}catch(Error e){
}
Gtk.Button delete_button = new Gtk.Button.with_label("Delete Pix");
delete_button.clicked.connect (() => {
//This is the line which resolved the issue - get the parent of the widget and destroy it and then destroy the widget
aEventBox2.get_parent().destroy();
aEventBox2.destroy();
});
library_mainbox.pack_start(library_scroll, true, true, 0);
library_mainbox.pack_end(delete_button, true, false, 0);
this.add(library_mainbox);
}
}
答案 0 :(得分:5)
每次将子窗口小部件添加到GtkFlowBox
时,流框小部件都会在其间添加隐式子窗口小部件,用于事件处理和样式目的 - 作为GtkFlowBox的文档说明: / p>
虽然GtkFlowBox必须只有GtkFlowBoxChild子节点,但您可以通过gtk_container_add()向其添加任何类型的小部件,并且GtkFlowBoxChild小部件将自动插入到框和小部件之间。
这意味着该行:
library_grid.add(aEventBox);
实际上相当于:
var flowbox_child = new Gtk.FlowBoxChild();
flowbox_child.add(aEventBox);
library_grid.add(flowbox_child);
如果您要从GtkFlowBox
删除小部件,并且只保留对您添加的子级的引用,则需要检索其父级并从GtkFlowBox
中删除它:
aEventBox.get_parent().destroy();
// or
library_grid.remove(aEventBox.get_parent());