diff --git a/czkawka_gui/src/double_click_opening.rs b/czkawka_gui/src/double_click_opening.rs
index 54ceb09..4553a97 100644
--- a/czkawka_gui/src/double_click_opening.rs
+++ b/czkawka_gui/src/double_click_opening.rs
@@ -1,6 +1,9 @@
 use crate::help_functions::*;
 use gtk::prelude::*;
 
+const KEY_ENTER: u16 = 36;
+const KEY_SPACE: u16 = 65;
+
 // TODO add option to open files and folders from context menu activated by pressing ONCE with right mouse button
 
 pub fn opening_double_click_function_duplicates(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -12,10 +15,7 @@ pub fn opening_double_click_function_duplicates(tree_view: &gtk::TreeView, event
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_duplicates(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsDuplicates::Name as i32, ColumnsDuplicates::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsDuplicates::Name as u32, ColumnsDuplicates::Path as u32, ColumnsDuplicates::ActiveSelectButton as u32)
 }
 
 pub fn opening_double_click_function_empty_folders(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -27,11 +27,9 @@ pub fn opening_double_click_function_empty_folders(tree_view: &gtk::TreeView, ev
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_empty_folders(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsEmptyFolders::Name as i32, ColumnsEmptyFolders::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsEmptyFolders::Name as u32, ColumnsEmptyFolders::Path as u32, ColumnsEmptyFolders::ActiveSelectButton as u32)
 }
+
 pub fn opening_double_click_function_empty_files(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
     if event.event_type() == gdk::EventType::DoubleButtonPress && event.button() == 1 {
         common_open_function(tree_view, ColumnsEmptyFiles::Name as i32, ColumnsEmptyFiles::Path as i32, OpenMode::PathAndName);
@@ -41,10 +39,7 @@ pub fn opening_double_click_function_empty_files(tree_view: &gtk::TreeView, even
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_empty_files(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsEmptyFiles::Name as i32, ColumnsEmptyFiles::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsEmptyFiles::Name as u32, ColumnsEmptyFiles::Path as u32, ColumnsEmptyFiles::ActiveSelectButton as u32)
 }
 
 pub fn opening_double_click_function_temporary_files(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -56,10 +51,7 @@ pub fn opening_double_click_function_temporary_files(tree_view: &gtk::TreeView,
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_temporary_files(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsTemporaryFiles::Name as i32, ColumnsTemporaryFiles::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsTemporaryFiles::Name as u32, ColumnsTemporaryFiles::Path as u32, ColumnsTemporaryFiles::ActiveSelectButton as u32)
 }
 
 pub fn opening_double_click_function_big_files(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -71,10 +63,7 @@ pub fn opening_double_click_function_big_files(tree_view: &gtk::TreeView, event:
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_big_files(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsBigFiles::Name as i32, ColumnsBigFiles::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsBigFiles::Name as u32, ColumnsBigFiles::Path as u32, ColumnsBigFiles::ActiveSelectButton as u32)
 }
 
 pub fn opening_double_click_function_zeroed_files(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -86,10 +75,7 @@ pub fn opening_double_click_function_zeroed_files(tree_view: &gtk::TreeView, eve
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_zeroed_files(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsZeroedFiles::Name as i32, ColumnsZeroedFiles::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsZeroedFiles::Name as u32, ColumnsZeroedFiles::Path as u32, ColumnsZeroedFiles::ActiveSelectButton as u32)
 }
 
 pub fn opening_double_click_function_same_music(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -101,10 +87,7 @@ pub fn opening_double_click_function_same_music(tree_view: &gtk::TreeView, event
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_same_music(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsSameMusic::Name as i32, ColumnsSameMusic::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsSameMusic::Name as u32, ColumnsSameMusic::Path as u32, ColumnsSameMusic::ActiveSelectButton as u32)
 }
 
 pub fn opening_double_click_function_similar_images(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -115,11 +98,9 @@ pub fn opening_double_click_function_similar_images(tree_view: &gtk::TreeView, e
     }
     gtk::Inhibit(false)
 }
+
 pub fn opening_enter_function_similar_images(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsSimilarImages::Name as i32, ColumnsSimilarImages::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsSimilarImages::Name as u32, ColumnsSimilarImages::Path as u32, ColumnsSimilarImages::ActiveSelectButton as u32)
 }
 
 pub fn opening_double_click_function_invalid_symlinks(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -131,10 +112,7 @@ pub fn opening_double_click_function_invalid_symlinks(tree_view: &gtk::TreeView,
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_invalid_symlinks(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsInvalidSymlinks::Name as i32, ColumnsInvalidSymlinks::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsInvalidSymlinks::Name as u32, ColumnsInvalidSymlinks::Path as u32, ColumnsInvalidSymlinks::ActiveSelectButton as u32)
 }
 
 pub fn opening_double_click_function_broken_files(tree_view: &gtk::TreeView, event: &gdk::EventButton) -> gtk::Inhibit {
@@ -146,18 +124,27 @@ pub fn opening_double_click_function_broken_files(tree_view: &gtk::TreeView, eve
     gtk::Inhibit(false)
 }
 pub fn opening_enter_function_broken_files(tree_view: &gtk::TreeView, event: &gdk::EventKey) -> gtk::Inhibit {
-    if event.keycode() == Some(36) {
-        common_open_function(tree_view, ColumnsBrokenFiles::Name as i32, ColumnsBrokenFiles::Path as i32, OpenMode::PathAndName);
-    }
-    gtk::Inhibit(false)
+    handle_tree_keypress(tree_view, event, ColumnsBrokenFiles::Name as u32, ColumnsBrokenFiles::Path as u32, ColumnsBrokenFiles::ActiveSelectButton as u32)
 }
 
-pub enum OpenMode {
+enum OpenMode {
     OnlyPath,
     PathAndName,
 }
 
-pub fn common_open_function(tree_view: &gtk::TreeView, column_name: i32, column_path: i32, opening_mode: OpenMode) {
+fn common_mark_function(tree_view: &gtk::TreeView, column_name: u32) {
+    let selection = tree_view.selection();
+    let (selection_rows, tree_model) = selection.selected_rows();
+
+    let model = get_list_store(tree_view);
+
+    for tree_path in selection_rows.iter().rev() {
+        let value = !tree_model.value(&tree_model.iter(tree_path).unwrap(), column_name as i32).get::<bool>().unwrap();
+        model.set_value(&tree_model.iter(tree_path).unwrap(), column_name, &value.to_value());
+    }
+}
+
+fn common_open_function(tree_view: &gtk::TreeView, column_name: i32, column_path: i32, opening_mode: OpenMode) {
     let selection = tree_view.selection();
     let (selection_rows, tree_model) = selection.selected_rows();
 
@@ -180,3 +167,18 @@ pub fn common_open_function(tree_view: &gtk::TreeView, column_name: i32, column_
         }
     }
 }
+
+fn handle_tree_keypress(tree_view: &gtk::TreeView, event: &gdk::EventKey, name_column: u32, path_column: u32, mark_column: u32) -> gtk::Inhibit {
+    match event.keycode() {
+        Some(KEY_ENTER) => {
+            // Enter
+            common_open_function(tree_view, name_column as i32, path_column as i32, OpenMode::PathAndName);
+        }
+        Some(KEY_SPACE) => {
+            // Space
+            common_mark_function(tree_view, mark_column);
+        }
+        _ => {}
+    }
+    gtk::Inhibit(false)
+}