New: non-editable but selectable text fields can become the first responder.

Without this change, text fields with setEditable:NO but setSelectable:YES could not become the first responder, and so would not listen for copy: events.

This change allows selectable fields to become the first responder, taking advantage of the distinction between first responder and first key responder maintained internally in CPTextField - a merely selectable field does not become the first key responder.

Refs #1972.

AppKit/CPTextField.j

@@ -351,8 +351,8 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
     else
         [self unsetThemeState:CPThemeStateEditable];
 
-    // We only allow first responder status if the field is editable and enabled.
-    if (!shouldBeEditable && [[self window] firstResponder] === self)
+    // We only allow first responder status if the field is enable, and editable or selectable.
+    if (!(shouldBeEditable && ![self isSelectable]) && [[self window] firstResponder] === self)
         [[self window] makeFirstResponder:nil];
 
     if (shouldBeEditable)
@@ -377,7 +377,7 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 {
     [super setEnabled:shouldBeEnabled];
 
-    // We only allow first responder status if the field is editable and enabled.
+    // We only allow first responder status if the field is enabled.
     if (!shouldBeEnabled && [[self window] firstResponder] === self)
         [[self window] makeFirstResponder:nil];
 }
@@ -531,7 +531,7 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 /*! @ignore */
 - (BOOL)acceptsFirstResponder
 {
-    return [self isEditable] && [self isEnabled] && [self _isWithinUsablePlatformRect];
+    return ([self isEditable] || [self isSelectable]) && [self isEnabled] && [self _isWithinUsablePlatformRect];
 }
 
 /*! @ignore */
@@ -542,7 +542,7 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 
     _isEditing = NO;
 
-    if ([[self window] isKeyWindow])
+    if ([[self window] isKeyWindow] && [self isEditable])
         return [self _becomeFirstKeyResponder];
 
     return YES;
@@ -552,6 +552,9 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
     A text field can be the first responder without necessarily being the focus of keyboard input. For example, it might be the first responder of window A but window B is the main and key window. It's important we don't put a focused input field into a text field in a non-key window, even if that field is the first responder, because the key window might also have a first responder text field which the user will expect to receive keyboard input.
 
     Since a first responder but non-key window text field can't receive input it should not even look like an active text field (Cocoa has a "slightly active" text field look it uses when another window is the key window, but Cappuccino doesn't today.)
+
+    It's also possible for a text field to be non-editable but selectable in which case it can also become the first responder -
+    this is what allows text to be copied from it.
 */
 - (BOOL)_becomeFirstKeyResponder
 {
@@ -560,6 +563,11 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
     if (![self _isWithinUsablePlatformRect])
         return NO;
 
+    // A selectable but non-editable text field may be the first responder, but never the
+    // first key responder (first key responder indicating editability.)
+    if (![self isEditable])
+        return NO;
+
     [self setThemeState:CPThemeStateEditing];
 
     [self _updatePlaceholderState];
@@ -680,24 +688,26 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 - (BOOL)resignFirstResponder
 {
 #if PLATFORM(DOM)
-
-    var element = [self _inputElement],
-        newValue = element.value,
-        error = @"";
-
-    if (newValue !== _stringValue)
+    // We might have been the first responder without actually editing.
+    if (_isEditing)
     {
-        [self _setStringValue:newValue];
-    }
+        var element = [self _inputElement],
+            newValue = element.value,
+            error = @"";
 
-    // If there is a formatter, always give it a chance to reject the resignation,
-    // even if the value has not changed.
-    if ([self _valueIsValid:newValue] === NO)
-    {
-        element.focus();
-        return NO;
-    }
+        if (newValue !== _stringValue)
+        {
+            [self _setStringValue:newValue];
+        }
 
+        // If there is a formatter, always give it a chance to reject the resignation,
+        // even if the value has not changed.
+        if ([self _valueIsValid:newValue] === NO)
+        {
+            element.focus();
+            return NO;
+        }
+    }
 #endif
 
     // When we are no longer the first responder we don't worry about the key status of our window anymore.
@@ -706,10 +716,13 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
     [self _resignFirstKeyResponder];
 
     _isEditing = NO;
-    [self textDidEndEditing:[CPNotification notificationWithName:CPControlTextDidEndEditingNotification object:self userInfo:nil]];
+    if ([self isEditable])
+    {
+        [self textDidEndEditing:[CPNotification notificationWithName:CPControlTextDidEndEditingNotification object:self userInfo:nil]];
 
-    if ([self sendsActionOnEndEditing])
-        [self sendAction:[self action] to:[self target]];
+        if ([self sendsActionOnEndEditing])
+            [self sendAction:[self action] to:[self target]];
+    }
 
     [self textDidBlur:[CPNotification notificationWithName:CPTextFieldDidBlurNotification object:self userInfo:nil]];
 
@@ -782,6 +795,9 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 
 - (void)_windowDidBecomeKey:(CPNotification)aNotification
 {
+    if (![self isEditable])
+        return;
+
     var wind = [self window];
 
     if ([wind isKeyWindow] && [wind firstResponder] === self)
@@ -828,6 +844,17 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
     return [self acceptsFirstResponder];
 }
 
+- (void)_didEdit
+{
+    if (!_isEditing)
+    {
+        _isEditing = YES;
+        [self textDidBeginEditing:[CPNotification notificationWithName:CPControlTextDidBeginEditingNotification object:self userInfo:nil]];
+    }
+
+    [self textDidChange:[CPNotification notificationWithName:CPControlTextDidChangeNotification object:self userInfo:nil]];
+}
+
 - (void)mouseDown:(CPEvent)anEvent
 {
     // Don't track! (ever?)
@@ -880,26 +907,21 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 
 - (void)keyUp:(CPEvent)anEvent
 {
-#if PLATFORM(DOM)
+    if (![self isEditable])
+        return;
 
+#if PLATFORM(DOM)
     var newValue = [self _inputElement].value;
 
     if (newValue !== _stringValue)
     {
         [self _setStringValue:newValue];
 
-        if (!_isEditing)
-        {
-            _isEditing = YES;
-            [self textDidBeginEditing:[CPNotification notificationWithName:CPControlTextDidBeginEditingNotification object:self userInfo:nil]];
-        }
-
-        [self textDidChange:[CPNotification notificationWithName:CPControlTextDidChangeNotification object:self userInfo:nil]];
+        [self _didEdit];
     }
 
-#endif
-
     [[[self window] platformWindow] _propagateCurrentDOMEvent:YES];
+#endif
 }
 
 - (void)keyDown:(CPEvent)anEvent
@@ -940,6 +962,7 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
     if (newValue !== _stringValue)
     {
         [self _setStringValue:newValue];
+        [self _didEdit];
     }
 
     if ([self _valueIsValid:_stringValue])
@@ -993,13 +1016,7 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
     // NOTE: _stringValue is now the current input element value
     if (oldValue !== _stringValue)
     {
-        if (!_isEditing)
-        {
-            _isEditing = YES;
-            [self textDidBeginEditing:[CPNotification notificationWithName:CPControlTextDidBeginEditingNotification object:self userInfo:nil]];
-        }
-
-        [self textDidChange:[CPNotification notificationWithName:CPControlTextDidChangeNotification object:self userInfo:nil]];
+        [self _didEdit];
     }
 
 #endif
@@ -1298,6 +1315,9 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 
 - (void)cut:(id)sender
 {
+    if (![self isEnabled])
+        return;
+
     [self copy:sender];
 
     if (![self isEditable])
@@ -1336,7 +1356,8 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
             pasteString = [pasteboard stringForType:CPStringPboardType],
             newValue = [_stringValue stringByReplacingCharactersInRange:selectedRange withString:pasteString];
 
-        [self setStringValue:newValue];
+        [self _setStringValue:newValue];
+        [self _didEdit];
         [self setSelectedRange:CPMakeRange(selectedRange.location + pasteString.length, 0)];
     }
     // If we don't have an oninput listener, we won't detect the change made by the cut and need to fake a key up "soon".
@@ -1447,8 +1468,9 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 
     var newValue = [_stringValue stringByReplacingCharactersInRange:selectedRange withString:""];
 
-    [self setStringValue:newValue];
+    [self _setStringValue:newValue];
     [self setSelectedRange:CPMakeRange(selectedRange.location, 0)];
+    [self _didEdit];
 }
 
 #pragma mark Setting the Delegate
@@ -1629,7 +1651,7 @@ CPTextFieldStatePlaceholder = CPThemeState("placeholder");
 {
     [super viewDidUnhide];
 
-    if ([[self window] firstResponder] === self)
+    if ([self isEditable] && [[self window] firstResponder] === self)
         [self _becomeFirstKeyResponder];
 }