//
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// Protocols.swift
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// EmptyDataSet-Swift
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//
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// Created by YZF on 27/6/17.
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// Copyright © 2017年 Xiaoye. All rights reserved.
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//
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import Foundation
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import UIKit
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/// The object that acts as the data source of the empty datasets.
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/// @discussion The data source must adopt the DZNEmptyDataSetSource protocol. The data source is not retained. All data source methods are optional.
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public protocol EmptyDataSetSource {
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/// Asks the data source for the title of the dataset.
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/// The dataset uses a fixed font style by default, if no attributes are set. If you want a different font style, return a attributed string.
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///
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/// - Parameter scrollView: scrollView A scrollView subclass informing the data source.
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/// - Returns: An attributed string for the dataset title, combining font, text color, text pararaph style, etc.
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func title(forEmptyDataSet scrollView: UIScrollView) -> NSAttributedString?
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/// Asks the data source for the description of the dataset.
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/// The dataset uses a fixed font style by default, if no attributes are set. If you want a different font style, return a attributed string.
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///
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/// - Parameter scrollView: scrollView A scrollView subclass informing the data source.
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/// - Returns: An attributed string for the dataset description text, combining font, text color, text pararaph style, etc.
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func description(forEmptyDataSet scrollView: UIScrollView) -> NSAttributedString?
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/// Asks the data source for the image of the dataset.
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///
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/// - Parameter scrollView: A scrollView subclass informing the data source.
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/// - Returns: An image for the dataset.
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func image(forEmptyDataSet scrollView: UIScrollView) -> UIImage?
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/// Asks the data source for a tint color of the image dataset. Default is nil.
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///
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/// - Parameter scrollView: A scrollView subclass object informing the data source.
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/// - Returns: A color to tint the image of the dataset.
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func imageTintColor(forEmptyDataSet scrollView: UIScrollView) -> UIColor?
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/// Asks the data source for the image animation of the dataset.
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///
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/// - Parameter scrollView: A scrollView subclass object informing the delegate.
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/// - Returns: image animation
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func imageAnimation(forEmptyDataSet scrollView: UIScrollView) -> CAAnimation?
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/// Asks the data source for the title to be used for the specified button state.
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/// The dataset uses a fixed font style by default, if no attributes are set. If you want a different font style, return a attributed string.
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///
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/// - Parameters:
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/// - scrollView: A scrollView subclass object informing the data source.
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/// - forState: The state that uses the specified title. The possible values are described in UIControlState.
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/// - Returns: An attributed string for the dataset button title, combining font, text color, text pararaph style, etc.
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func buttonTitle(forEmptyDataSet scrollView: UIScrollView, for state: UIControl.State) -> NSAttributedString?
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/// Asks the data source for the image to be used for the specified button state.
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/// This method will override buttonTitleForEmptyDataSet:forState: and present the image only without any text.
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///
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/// - Parameters:
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/// - scrollView: A scrollView subclass object informing the data source.
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/// - forState: The state that uses the specified title. The possible values are described in UIControlState.
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/// - Returns: An image for the dataset button imageview.
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func buttonImage(forEmptyDataSet scrollView: UIScrollView, for state: UIControl.State) -> UIImage?
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/// Asks the data source for a background image to be used for the specified button state.
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/// There is no default style for this call.
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///
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/// - Parameters:
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/// - scrollView: A scrollView subclass informing the data source.
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/// - forState: The state that uses the specified image. The values are described in UIControlState.
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/// - Returns: An attributed string for the dataset button title, combining font, text color, text pararaph style, etc.
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func buttonBackgroundImage(forEmptyDataSet scrollView: UIScrollView, for state: UIControl.State) -> UIImage?
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/// Asks the data source for the background color of the dataset. Default is clear color.
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///
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/// - Parameter scrollView: A scrollView subclass object informing the data source.
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/// - Returns: A color to be applied to the dataset background view.
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func backgroundColor(forEmptyDataSet scrollView: UIScrollView) -> UIColor?
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/// Asks the data source for a custom view to be displayed instead of the default views such as labels, imageview and button. Default is nil.
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/// Use this method to show an activity view indicator for loading feedback, or for complete custom empty data set.
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/// Returning a custom view will ignore -offsetForEmptyDataSet and -spaceHeightForEmptyDataSet configurations.
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///
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/// - Parameter scrollView: A scrollView subclass object informing the delegate.
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/// - Returns: The custom view.
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func customView(forEmptyDataSet scrollView: UIScrollView) -> UIView?
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/// Asks the data source for a offset for vertical alignment of the content. Default is 0.
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///
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/// - Parameter scrollView: A scrollView subclass object informing the delegate.
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/// - Returns: The offset for vertical alignment.
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func verticalOffset(forEmptyDataSet scrollView: UIScrollView) -> CGFloat
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/// Asks the data source for a vertical space between elements. Default is 11 pts.
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///
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/// - Parameter scrollView: A scrollView subclass object informing the delegate.
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/// - Returns: The space height between elements.
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func spaceHeight(forEmptyDataSet scrollView: UIScrollView) -> CGFloat
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}
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public extension EmptyDataSetSource {
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func title(forEmptyDataSet scrollView: UIScrollView) -> NSAttributedString? {
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return nil
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}
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func description(forEmptyDataSet scrollView: UIScrollView) -> NSAttributedString? {
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return nil
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}
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func image(forEmptyDataSet scrollView: UIScrollView) -> UIImage? {
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return nil
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}
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func imageTintColor(forEmptyDataSet scrollView: UIScrollView) -> UIColor? {
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return nil
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}
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func imageAnimation(forEmptyDataSet scrollView: UIScrollView) -> CAAnimation? {
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return nil
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}
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func buttonTitle(forEmptyDataSet scrollView: UIScrollView, for state: UIControl.State) -> NSAttributedString? {
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return nil
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}
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func buttonImage(forEmptyDataSet scrollView: UIScrollView, for state: UIControl.State) -> UIImage? {
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return nil
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}
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func buttonBackgroundImage(forEmptyDataSet scrollView: UIScrollView, for state: UIControl.State) -> UIImage? {
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return nil
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}
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func backgroundColor(forEmptyDataSet scrollView: UIScrollView) -> UIColor? {
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return nil
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}
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func customView(forEmptyDataSet scrollView: UIScrollView) -> UIView? {
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return nil
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}
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func verticalOffset(forEmptyDataSet scrollView: UIScrollView) -> CGFloat {
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return 0
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}
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func spaceHeight(forEmptyDataSet scrollView: UIScrollView) -> CGFloat {
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return 11
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}
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}
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