checkbox: allow (un)checking via +-= keys

1 files changed, 19 insertions, 0 deletions

diff --git a/alf/alfbutton.cpp b/alf/alfbutton.cpp
index f809410..f41b0b5 100644
--- a/alf/alfbutton.cpp
+++ b/alf/alfbutton.cpp
@@ -780,6 +780,11 @@ ALF_NtButton_WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         ALF_NtButton_Paint(hwnd, priv, (HDC)wParam, &rc);
     } else if (uMsg == WM_GETDLGCODE) {
         if (priv->drawFlags & ALF_NTBTN_FLAG_DRAW_CHECKBOX || priv->drawFlags & ALF_NTBTN_FLAG_DRAW_TRISTATE) {
+            if (lParam && ((MSG *)lParam)->message == WM_CHAR && (
+                    ((MSG *)lParam)->wParam == '+' || ((MSG *)lParam)->wParam == '-' || ((MSG *)lParam)->wParam == '=')) {
+                return DLGC_WANTCHARS | DLGC_BUTTON;
+            }
+
             return DLGC_BUTTON;
         } else if (priv->drawFlags & ALF_NTBTN_FLAG_DRAW_RADIOBTN) {
             return DLGC_RADIOBUTTON;
@@ -900,6 +905,20 @@ ALF_NtButton_WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
                 }
             }
         }
+    } else if (uMsg == WM_CHAR) {
+        if (priv->drawFlags & ALF_NTBTN_FLAG_DRAW_CHECKBOX) {
+            if (wParam == '+' || wParam == '=') {
+                // check
+                if (!(priv->drawFlags & ALF_NTBTN_FLAG_IS_CHECKED)) {
+                    ALF_NtButton_Clicked(hwnd, priv);
+                }
+            } else if (wParam == '-') {
+                // uncheck
+                if (priv->drawFlags & ALF_NTBTN_FLAG_IS_CHECKED) {
+                    ALF_NtButton_Clicked(hwnd, priv);
+                }
+            }
+        }
     } else if (uMsg == WM_ERASEBKGND) {
         return TRUE;
     } else if (uMsg == WM_SETTEXT) {