Add function to set the ID of the window (#16)

* Add function to set the window ID

* Update CHANGELOG.md

CHANGELOG.md

@@ -9,6 +9,7 @@
 - Added `FileDialog::title` to overwrite the window title [#12](https://github.com/fluxxcode/egui-file-dialog/pull/12)
 - Added `FileDialog::resizable` to set if the window is resizable [#15](https://github.com/fluxxcode/egui-file-dialog/pull/15)
 - Added `FileDialog::movable` to set if the window is movable [#15](https://github.com/fluxxcode/egui-file-dialog/pull/15)
+- Added `FileDialog::id` to set the ID of the window [#16](https://github.com/fluxxcode/egui-file-dialog/pull/16)
 
 ### 🔧 Changes
 - Removed the version of `egui-file-dialog` in the examples [#8](https://github.com/fluxxcode/egui-file-dialog/pull/8)

examples/sandbox/src/main.rs

@@ -15,7 +15,8 @@ impl MyApp {
     pub fn new(_cc: &eframe::CreationContext) -> Self {
         Self {
             file_dialog: FileDialog::new()
-                .anchor(egui::Align2::CENTER_CENTER, egui::Vec2::new(0.0, 0.0)),
+                .anchor(egui::Align2::CENTER_CENTER, egui::Vec2::new(0.0, 0.0))
+                .id("egui_file_dialog"),
 
             selected_directory: None,
             selected_file: None,

src/file_dialog.rs

@@ -100,6 +100,8 @@ pub struct FileDialog {
     /// If set, the window title will be overwritten and set to the fixed value instead
     /// of being set dynamically.
     window_overwrite_title: Option<String>,
+    /// The ID of the window.
+    window_id: Option<egui::Id>,
     /// The default size of the window.
     window_default_size: egui::Vec2,
     /// The anchor of the window.
@@ -155,6 +157,7 @@ impl FileDialog {
 
             window_title: String::from("Select directory"),
             window_overwrite_title: None,
+            window_id: None,
             window_default_size: egui::Vec2::new(650.0, 370.0),
             window_anchor: None,
             window_resizable: true,
@@ -193,6 +196,12 @@ impl FileDialog {
         self
     }
 
+    /// Sets the ID of the window.
+    pub fn id(mut self, id: impl Into<egui::Id>) -> Self {
+        self.window_id = Some(id.into());
+        self
+    }
+
     /// Sets the default size of the window.
     pub fn default_size(mut self, size: impl Into<egui::Vec2>) -> Self {
         self.window_default_size = size.into();
@@ -375,6 +384,10 @@ impl FileDialog {
             .movable(self.window_movable)
             .collapsible(false);
 
+        if let Some(id) = self.window_id {
+            window = window.id(id);
+        }
+
         if let Some((anchor, offset)) = self.window_anchor {
             window = window.anchor(anchor, offset);
         }