Add ReturnKeyType enum to Qt namespace

This will allow to utilize the native return keys provided by most mobile
platforms, to indicate what kind of action pressing it will result in,
such as performing a search, a navigation, moving on to the next input
field or just closing the keyboard.

[ChangeLog][QtCore][Global] Added ReturnKeyType enum allowing for fine-grained
control of the platform's on screen keyboard return key

Change-Id: I6a691045ad6970e6893f23773b2449a7bafd98fc
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@theqtcompany.com>

src/corelib/global/qnamespace.h

@@ -1322,6 +1322,7 @@ public:
         ImAbsolutePosition = 0x400,
         ImTextBeforeCursor = 0x800,
         ImTextAfterCursor = 0x1000,
+        ImReturnKeyType = 0x2000,
 
         ImPlatformData = 0x80000000,
         ImQueryInput = ImCursorRectangle | ImCursorPosition | ImSurroundingText |
@@ -1361,6 +1362,17 @@ public:
     };
     Q_DECLARE_FLAGS(InputMethodHints, InputMethodHint)
 
+    enum ReturnKeyType {
+        ReturnKeyDefault,
+        ReturnKeyEnter,
+        ReturnKeyDone,
+        ReturnKeyGo,
+        ReturnKeySend,
+        ReturnKeySearch,
+        ReturnKeyNext,
+        ReturnKeyPrevious
+    };
+
     enum ToolButtonStyle {
         ToolButtonIconOnly,
         ToolButtonTextOnly,
@@ -1681,6 +1693,7 @@ public:
     QT_Q_ENUM(InputMethodHint)
     QT_Q_ENUM(InputMethodQuery)
     QT_Q_FLAG(InputMethodHints)
+    QT_Q_ENUM(ReturnKeyType)
     QT_Q_FLAG(InputMethodQueries)
     QT_Q_FLAG(TouchPointStates)
     QT_Q_ENUM(ScreenOrientation)

src/corelib/global/qnamespace.qdoc

@@ -2513,6 +2513,7 @@
                                 but \b{must} not return an empty string unless the cursor is at the start of the document.
     \value ImTextAfterCursor    The plain text after the cursor. The widget can decide how much text to return,
                                 but \b{must} not return an empty string unless the cursor is at the end of the document.
+    \value ImReturnKeyType      The return key type.
 
     Masks:
 
@@ -2522,6 +2523,36 @@
     \sa QInputMethodQueryEvent
 */
 
+/*!
+    \enum Qt::ReturnKeyType
+
+    This can be used to alter the appearance of the Return key on an on screen keyboard.
+
+    Note that not all of these values are supported on all platforms.
+
+    \value ReturnKeyDefault     The default return key.
+                                This can either be a button closing the keyboard, or a Return button
+                                causing a new line in case of a multi-line input field.
+    \value ReturnKeyEnter       Show a Return button that inserts a new line.
+                                The keyboard will not close when this button is pressed.
+    \value ReturnKeyDone        Show a "Done" button.
+                                The keyboard will close when this button is pressed.
+    \value ReturnKeyGo          Show a "Go" button.
+                                Typically used in an address bar when entering an URL; the keyboard
+                                will close when this button is pressed.
+    \value ReturnKeySend        Show a "Send" button.
+                                The keyboard will close when this button is pressed.
+    \value ReturnKeySearch      Show a "Search" button.
+                                The keyboard will close when this button is pressed.
+    \value ReturnKeyNext        Show a "Next" button.
+                                Typically used in a form to allow navigating to the next input field;
+                                the keyboard will not close when this button is pressed.
+    \value ReturnKeyPrevious    Show a "Previous" button.
+                                The keyboard will not close when this button is pressed.
+
+    \since 5.6
+*/
+
 /*!
     \enum Qt::ItemDataRole