From 43e72afe85bb9928d9f5e659bb5c24b41fb81c7a Mon Sep 17 00:00:00 2001
From: Joonas Javanainen <joonas.javanainen@gmail.com>
Date: Thu, 20 Aug 2015 22:04:22 +0300
Subject: [PATCH] Collapsing header + misc

---
 examples/test_window.rs | 25 ++++++++++++++++++
 src/lib.rs              | 25 +++++++++++++-----
 src/widgets.rs          | 56 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+), 6 deletions(-)
 create mode 100644 src/widgets.rs

diff --git a/examples/test_window.rs b/examples/test_window.rs
index 1d8b716..ec8c354 100644
--- a/examples/test_window.rs
+++ b/examples/test_window.rs
@@ -86,6 +86,25 @@ fn main() {
     }
 }
 
+fn show_user_guide<'a>(frame: &Frame<'a>) {
+    frame.bullet_text(im_str!("Double-click on title bar to collapse window."));
+    frame.bullet_text(im_str!("Click and drag on lower right corner to resize window."));
+    frame.bullet_text(im_str!("Click and drag on any empty space to move window."));
+    frame.bullet_text(im_str!("Mouse Wheel to scroll."));
+    frame.bullet_text(im_str!("TAB/SHIFT+TAB to cycle through keyboard editable fields."));
+    frame.bullet_text(im_str!("CTRL+Click on a slider or drag box to input text."));
+    frame.bullet_text(im_str!(
+"While editing text:
+- Hold SHIFT or use mouse to select text
+- CTRL+Left/Right to word jump
+- CTRL+A or double-click to select all
+- CTRL+X,CTRL+C,CTRL+V clipboard
+- CTRL+Z,CTRL+Y undo/redo
+- ESCAPE to revert
+- You can apply arithmetic operators +,*,/ on numerical values.
+  Use +- to subtract."));
+}
+
 fn show_test_window<'a>(frame: &Frame<'a>, state: &mut State) -> bool {
     if state.show_app_main_menu_bar { show_example_app_main_menu_bar(frame, state) }
     if state.show_app_fixed_overlay {
@@ -101,6 +120,7 @@ fn show_test_window<'a>(frame: &Frame<'a>, state: &mut State) -> bool {
                 frame.separator();
                 frame.text(im_str!("By Omar Cornut and all github contributors."));
                 frame.text(im_str!("ImGui is licensed under the MIT License, see LICENSE for more information."));
+                show_user_guide(frame);
             })
     }
 
@@ -157,6 +177,11 @@ fn show_test_window<'a>(frame: &Frame<'a>, state: &mut State) -> bool {
                     }
                 });
             });
+            frame.spacing();
+            if frame.collapsing_header(im_str!("Help")).build() {
+                frame.text_wrapped(im_str!("This window is being created by the show_test_window() function. Please refer to the code for programming reference.\n\nUser Guide:"));
+                show_user_guide(frame);
+            }
         })
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index 9240ff5..3528091 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -31,10 +31,12 @@ pub use ffi::{
    ImVec2, ImVec4
 };
 pub use menus::{Menu, MenuItem};
+pub use widgets::{CollapsingHeader};
 pub use window::{Window};
 
 pub mod ffi;
 mod menus;
+mod widgets;
 mod window;
 
 #[cfg(feature = "glium")]
@@ -201,6 +203,7 @@ impl<'fr> Frame<'fr> {
       }
       Ok(())
    }
+   pub fn show_user_guide(&self) { unsafe { ffi::igShowUserGuide() }; }
    pub fn show_test_window(&self) -> bool {
       let mut opened = true;
       unsafe {
@@ -208,6 +211,13 @@ impl<'fr> Frame<'fr> {
       }
       opened
    }
+   pub fn show_metrics_window(&self) -> bool {
+      let mut opened = true;
+      unsafe {
+         ffi::igShowMetricsWindow(&mut opened);
+      }
+      opened
+   }
 }
 
 // Window
@@ -215,6 +225,12 @@ impl<'fr> Frame<'fr> {
    pub fn window<'p>(&self) -> Window<'fr, 'p> { Window::new() }
 }
 
+// Layout
+impl<'fr> Frame<'fr> {
+   pub fn separator(&self) { unsafe { ffi:: igSeparator() }; }
+   pub fn spacing(&self) { unsafe { ffi::igSpacing() }; }
+}
+
 // Widgets
 impl<'fr> Frame<'fr> {
    pub fn text<'b>(&self, text: ImStr<'b>) {
@@ -253,6 +269,9 @@ impl<'fr> Frame<'fr> {
          ffi::igBulletText(fmt_ptr(), text.as_ptr());
       }
    }
+   pub fn collapsing_header<'p>(&self, label: ImStr<'p>) -> CollapsingHeader<'fr, 'p> {
+      CollapsingHeader::new(label)
+   }
 }
 
 // Widgets: Menus
@@ -275,12 +294,6 @@ impl<'fr> Frame<'fr> {
    pub fn menu_item<'p>(&self, label: ImStr<'p>) -> MenuItem<'fr, 'p> { MenuItem::new(label) }
 }
 
-impl<'fr> Frame<'fr> {
-   pub fn separator(&self) {
-      unsafe { ffi:: igSeparator() };
-   }
-}
-
 struct RenderDrawListsState(*mut ffi::ImDrawData);
 unsafe impl Sync for RenderDrawListsState {}
 
diff --git a/src/widgets.rs b/src/widgets.rs
new file mode 100644
index 0000000..c8741fd
--- /dev/null
+++ b/src/widgets.rs
@@ -0,0 +1,56 @@
+use std::marker::PhantomData;
+use std::ptr;
+
+use super::ffi;
+use super::{Frame, ImStr};
+
+pub struct CollapsingHeader<'fr, 'p> {
+   label: ImStr<'p>,
+   str_id: Option<ImStr<'p>>,
+   display_frame: bool,
+   default_open: bool,
+   _phantom: PhantomData<&'fr Frame<'fr>>
+}
+
+impl<'fr, 'p> CollapsingHeader<'fr, 'p> {
+   pub fn new(label: ImStr<'p>) -> Self {
+      CollapsingHeader {
+         label: label,
+         str_id: None,
+         display_frame: true,
+         default_open: false,
+         _phantom: PhantomData
+      }
+   }
+   #[inline]
+   pub fn str_id(self, str_id: ImStr<'p>) -> Self {
+      CollapsingHeader {
+         str_id: Some(str_id),
+         .. self
+      }
+   }
+   #[inline]
+   pub fn display_frame(self, display_frame: bool) -> Self {
+      CollapsingHeader {
+         display_frame: display_frame,
+         .. self
+      }
+   }
+   #[inline]
+   pub fn default_open(self, default_open: bool) -> Self {
+      CollapsingHeader {
+         default_open: default_open,
+         .. self
+      }
+   }
+   pub fn build(self) -> bool {
+      unsafe {
+         ffi::igCollapsingHeader(
+            self.label.as_ptr(),
+            self.str_id.map(|x| x.as_ptr()).unwrap_or(ptr::null()),
+            self.display_frame,
+            self.default_open
+         )
+      }
+   }
+}