components/TextFields/src/MDCTextFieldPositioningDelegate.h

// Copyright 2016-present the Material Components for iOS authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#import <UIKit/UIKit.h>

/**
 MDCTextInputPositioningDelegate allows objects outside an MDCTextInput, like
 MDCTextInputController, to pass the MDCTextInput important layout information.

 Usually, these methods are direct mirrors of internal methods with the addition of a default value.
 */

@protocol MDCTextInputPositioningDelegate <NSObject>

@optional

/**
 The actual input view and the rendered inputted text's position is determined by applying these
 insets to the bounds.

 @param defaultInsets The value of text container insets that the MDCTextInput has calculated by
 default.
 */
- (UIEdgeInsets)textInsets:(UIEdgeInsets)defaultInsets;

/**
 The area that inputted text should be displayed while isEditing = true.

 @param defaultRect The default value of the editing rect. It is usually the text rect shrunk or
 enlarged depending on rightView, leftView, or clearButton presences.
 */
- (CGRect)editingRectForBounds:(CGRect)bounds defaultRect:(CGRect)defaultRect;

/**
 The area that the leadingView should inhabit when shown.

 @param defaultRect The default value of the leading view rect.
 */
- (CGRect)leadingViewRectForBounds:(CGRect)bounds defaultRect:(CGRect)defaultRect;

/**
 The amount of horizontal space between the leading view and the text input box.

 Defaults to 0.0;
 */
- (CGFloat)leadingViewTrailingPaddingConstant;

/** Called from the end of the input's layoutSubviews. */
- (void)textInputDidLayoutSubviews;

/** Called from the end of the input's updateConstraints. */
- (void)textInputDidUpdateConstraints;

/**
 The area that the trailingView should inhabit when shown.

 @param defaultRect The default value of the trailing view rect.
 */
- (CGRect)trailingViewRectForBounds:(CGRect)bounds defaultRect:(CGRect)defaultRect;

/**
 The amount of horizontal space between the trailing view and the text input box.

 Defaults to 0.0;
 */
- (CGFloat)trailingViewTrailingPaddingConstant;

@end