Add FileSelection dialog type

This patch adds the FileSelection struct representing a file selection
dialog.  It can be displayed using the backend’s show_file_selection
function.

Currently, we only support file open dialogs (i. e.  choosing an
existing file).  Support for save dialogs should be added in the future.

1 files changed, 13 insertions, 0 deletions

diff --git a/examples/file_selection.rs b/examples/file_selection.rs
new file mode 100644
index 0000000..5436742
--- /dev/null
+++ b/examples/file_selection.rs
@@ -0,0 +1,13 @@
+// Copyright (C) 2019 Robin Krahl <robin.krahl@ireas.org>
+// SPDX-License-Identifier: MIT
+
+use dialog::DialogBox;
+
+fn main() -> dialog::Result<()> {
+    let choice = dialog::FileSelection::new("Please select a file")
+        .title("File Chooser Example")
+        .path("/etc")
+        .show()?;
+    println!("The user chose: {:?}", choice);
+    Ok(())
+}