mirror of
https://github.com/material-components/material-components-ios.git
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21d5cf1d04
Summary: Closes https://github.com/google/material-components-ios/issues/435. Reviewers: ajsecord, #mdc_ios_owners Reviewed By: ajsecord, #mdc_ios_owners Projects: #material_components_ios Differential Revision: http://codereview.cc/D759
91 lines
3.0 KiB
Swift
91 lines
3.0 KiB
Swift
/*
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Copyright 2015-present Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import UIKit
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// This viewcontroller contains a subview that has an MDCShadowLayer.
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// A gesture recognizer allows the user to adjust the elevation of the
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// shadowed view by pressing it, and move it by dragging it.
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class ShadowDragSquareExampleViewController: UIViewController {
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@IBOutlet weak var blueView: ExampleShadowedView!
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// The elevation of the view affects the size of its shadow.
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// The following elevations indicate to the user if the view
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// is pressed or not.
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let kRestingCardElevation: CGFloat = 2.0
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let kSelectedCardElevation: CGFloat = 8.0
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// A UILongPressGestureRecognizer handles the changing of elevation
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// and location of the shadowedView.
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let longPressRecogniser = UILongPressGestureRecognizer()
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// We store the offset from the initial touch to the center of the
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// view to properly update its location when dragged.
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var movingViewOffset = CGPointZero
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override func viewDidLoad() {
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super.viewDidLoad()
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self.blueView.setElevation(kRestingCardElevation)
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longPressRecogniser.addTarget(self, action: "longPressedInView:")
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longPressRecogniser.minimumPressDuration = 0.0
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self.blueView.addGestureRecognizer(longPressRecogniser)
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}
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func longPressedInView(sender:UILongPressGestureRecognizer) {
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// Elevation of the view is changed to indicate that it has been pressed or released.
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// view.center is changed to follow the touch events.
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if (sender.state == .Began) {
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self.blueView.setElevation(kSelectedCardElevation)
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let selfPoint = sender.locationInView(self.view)
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movingViewOffset.x = selfPoint.x - self.blueView.center.x
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movingViewOffset.y = selfPoint.y - self.blueView.center.y
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} else if (sender.state == .Changed) {
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let selfPoint = sender.locationInView(self.view)
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let newCenterPoint =
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CGPoint(x: selfPoint.x - movingViewOffset.x, y: selfPoint.y - movingViewOffset.y)
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self.blueView.center = newCenterPoint
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} else if (sender.state == .Ended) {
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self.blueView.setElevation(kRestingCardElevation)
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movingViewOffset = CGPointZero
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}
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}
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// MARK: catalog by convention
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class func catalogBreadcrumbs() -> Array<String> {
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return [ "Shadow", "Shadow Layer"]
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}
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class func catalogStoryboardName() -> String {
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return "ShadowDragSquareExample"
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}
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class func catalogDescription() -> String {
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return "Shadow Layer implements the Material Design specifications for elevation and shadows."
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}
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class func catalogIsPrimaryDemo() -> Bool {
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return true
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}
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}
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