feat: add a window drag resize task

1 files changed, 14 insertions, 1 deletions

diff --git a/runtime/src/window.rs b/runtime/src/window.rs
index 94ee0ae5..64395993 100644
--- a/runtime/src/window.rs
+++ b/runtime/src/window.rs
@@ -1,7 +1,8 @@
 //! Build window-based GUI applications.
 use crate::core::time::Instant;
 use crate::core::window::{
-    Event, Icon, Id, Level, Mode, Screenshot, Settings, UserAttention,
+    Direction, Event, Icon, Id, Level, Mode, Screenshot, Settings,
+    UserAttention,
 };
 use crate::core::{Point, Size};
 use crate::futures::event;
@@ -35,6 +36,13 @@ pub enum Action {
     /// button was pressed immediately before this function is called.
     Drag(Id),
 
+    /// Resize the window with the left mouse button until the button is
+    /// released.
+    ///
+    /// There’s no guarantee that this will work unless the left mouse
+    /// button was pressed immediately before this function is called.
+    DragResize(Id, Direction),
+
     /// Resize the window to the given logical dimensions.
     Resize(Id, Size),
 
@@ -272,6 +280,11 @@ pub fn drag<T>(id: Id) -> Task<T> {
     task::effect(crate::Action::Window(Action::Drag(id)))
 }
 
+/// Begins resizing the window while the left mouse button is held.
+pub fn drag_resize<T>(id: Id, direction: Direction) -> Task<T> {
+    task::effect(crate::Action::Window(Action::DragResize(id, direction)))
+}
+
 /// Resizes the window to the given logical dimensions.
 pub fn resize<T>(id: Id, new_size: Size) -> Task<T> {
     task::effect(crate::Action::Window(Action::Resize(id, new_size)))