From 73f13dd60f51ff05e31a64fba89fe31ab3ab185d Mon Sep 17 00:00:00 2001
From: 杨宇千 <crupest@outlook.com>
Date: Sun, 15 Sep 2019 00:03:11 +0800
Subject: ...

---
 include/cru/ui/click_detector.hpp  | 2 +-
 include/cru/ui/controls/button.hpp | 8 ++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

(limited to 'include/cru/ui')

diff --git a/include/cru/ui/click_detector.hpp b/include/cru/ui/click_detector.hpp
index 3806dd82..1a88b8a6 100644
--- a/include/cru/ui/click_detector.hpp
+++ b/include/cru/ui/click_detector.hpp
@@ -70,7 +70,7 @@ class ClickDetector : public Object {
       case MouseButton::Right:
         return click_map_.right;
       default:
-        std::abort();
+        UnreachableCode();
     }
   }
 
diff --git a/include/cru/ui/controls/button.hpp b/include/cru/ui/controls/button.hpp
index ca3dcae9..b5cca7dc 100644
--- a/include/cru/ui/controls/button.hpp
+++ b/include/cru/ui/controls/button.hpp
@@ -20,6 +20,8 @@ struct ButtonBorderStyle {
   render::BorderStyle hover;
   // corresponds to ButtonState::Press
   render::BorderStyle press;
+  // corresponds to ButtonState::PressCancel
+  render::BorderStyle press_cancel;
 };
 
 enum class ButtonState {
@@ -27,8 +29,10 @@ enum class ButtonState {
   Normal,
   // mouse is in it and not pressed
   Hover,
-  // mouse is pressed in it (click begins)
-  Press
+  // mouse is pressed in it
+  Press,
+  // mouse is pressed outside button
+  PressCancel,  
 };
 
 class Button : public ContentControl {
-- 
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