[Ui] Add popup_modal wrapper

src/lib.rs

@@ -25,6 +25,7 @@ pub use input::{
 pub use menus::{Menu, MenuItem};
 pub use plothistogram::PlotHistogram;
 pub use plotlines::PlotLines;
+pub use popup_modal::PopupModal;
 pub use progressbar::ProgressBar;
 pub use sliders::{
     SliderFloat, SliderFloat2, SliderFloat3, SliderFloat4, SliderInt, SliderInt2, SliderInt3,
@@ -49,6 +50,7 @@ mod input;
 mod menus;
 mod plothistogram;
 mod plotlines;
+mod popup_modal;
 mod progressbar;
 mod sliders;
 mod string;
@@ -1204,6 +1206,9 @@ impl<'ui> Ui<'ui> {
             unsafe { sys::igEndPopup() };
         }
     }
+    pub fn popup_modal<'p>(&self, str_id: &'p ImStr) -> PopupModal<'ui, 'p> {
+        PopupModal::new(self, str_id)
+    }
     pub fn close_current_popup(&self) {
         unsafe { sys::igCloseCurrentPopup() };
     }

src/popup_modal.rs

@@ -0,0 +1,44 @@
+use std::marker::PhantomData;
+use std::ptr;
+
+use super::{ImGuiWindowFlags, ImStr, Ui};
+
+use sys;
+
+#[must_use]
+pub struct PopupModal<'ui, 'p> {
+    label: &'p ImStr,
+    opened: Option<&'p mut bool>,
+    flags: ImGuiWindowFlags,
+    _phantom: PhantomData<&'ui Ui<'ui>>,
+}
+
+impl<'ui, 'p> PopupModal<'ui, 'p> {
+    pub fn new(_: &Ui<'ui>, label: &'p ImStr) -> Self {
+        PopupModal {
+            label,
+            opened: None,
+            flags: ImGuiWindowFlags::empty(),
+            _phantom: PhantomData,
+        }
+    }
+    pub fn opened(mut self, opened: &'p mut bool) -> Self {
+        self.opened = Some(opened);
+        self
+    }
+    pub fn build<F: FnOnce()>(self, f: F) {
+        let render = unsafe {
+            sys::igBeginPopupModal(
+                self.label.as_ptr(),
+                self.opened
+                    .map(|x| x as *mut bool)
+                    .unwrap_or(ptr::null_mut()),
+                self.flags,
+            )
+        };
+        if render {
+            f();
+            unsafe { sys::igEndMenu() };
+        }
+    }
+}