Add barState and InputBarDelegate to SLKTextInputbar (#2)

Author: blaswan

Source/SLKTextInputbar.h

@@ -23,11 +23,24 @@ typedef NS_ENUM(NSUInteger, SLKCounterPosition) {
     SLKCounterPositionBottom
 };
 
+typedef NS_ENUM(NSUInteger, SLKInputBarState) {
+    SLKInputBarStateNormal,
+    SLKInputBarStateHighlight,
+    SLKInputBarStateDisabled
+};
+
+@protocol SLKInputBarViewDelegate <NSObject>
+    - (void)barStateDidChange:(SLKInputBarState)state;
+@end
+
 NS_ASSUME_NONNULL_BEGIN
 
 /** @name A custom tool bar encapsulating messaging controls. */
 @interface SLKTextInputbar : UIToolbar
 
+@property (nonatomic, assign) SLKInputBarState barState;
+@property (nonatomic, weak) id<SLKInputBarViewDelegate> barDelegate;
+
 /** The centered text input view.
  The maximum number of lines is configured by default, to best fit each devices dimensions.
  For iPhone 4       (<=480pts): 4 lines

Source/SLKTextInputbar.m

@@ -102,8 +102,26 @@ - (void)slk_commonInit
     [self slk_registerTo:self.layer forSelector:@selector(position)];
     [self slk_registerTo:self.leftButton.imageView forSelector:@selector(image)];
     [self slk_registerTo:self.rightButton.titleLabel forSelector:@selector(font)];
+
+    self.barState = SLKInputBarStateNormal;
+}
+
+#pragma mark - SLKInputBarViewDelegate
+
+- (void)setBarDelegate:(id<SLKInputBarViewDelegate>)barDelegate
+{
+    _barDelegate = barDelegate;
+    self.barState = SLKInputBarStateNormal;
 }
 
+- (void)setBarState:(SLKInputBarState)barState
+{
+    if ([self.barDelegate respondsToSelector:@selector(barStateDidChange:)]) {
+        [self.barDelegate barStateDidChange:barState];
+    }
+
+    _barState = barState;
+}
 
 #pragma mark - UIView Overrides