unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, jpeg, ExtCtrls;

type
  TForm1 = class(TForm)
    Image1: TImage;
    Image2: TImage;
    Cut1: TButton;
    Paste: TButton;
    procedure Cut1Click(Sender: TObject);
    procedure PasteClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Cut1Click(Sender: TObject);
var

ARect: TRect;

begin

Clipboard.Assign(Image1.Picture);

with Image.Canvas do

begin

CopyMode := cmWhiteness;

ARect := Rect(0, 0, Image.Width, Image.Height);

CopyRect(ARect, Image.Canvas, ARect);

CopyMode := cmSrcCopy;

end;
end;

procedure TForm1.PasteClick(Sender: TObject);
var

Bitmap: TBitmap;

begin

if Clipboard.HasFormat(CF_BITMAP) then

begin

Bitmap := TBitmap.Create;

try

Bitmap.Assign(Clipboard);

Image.Canvas.Draw(0, 0, Bitmap);

finally

Bitmap.Free;

end;

end;
end;

end.

（1）介绍：
 
clipboard.js是一款轻量级的实现复制文本到剪贴板功能的JavaScript插件。通过该插件可以将输入框，文本域，DIV元素中的文本等文本内容复制到剪贴板中
 clipboard.js支持主流的浏览器：chrome 42+; Firefox 41+; IE 9+; opera 29+; Safari 10+;
 
 
（2）clipboard复印内容的方式有
 
从target复印目标内容
通过function 要复印的内容
通过属性返回复印的内容
 
 
target复印目标内容，这里不说，就说一下function和属性的操作。
 
（3）Function操作有两种：
 
第一种：
 通过target的function复印内容
 通过target指定要复印的节点，这里返回舒值是‘hello’
 
   <button class="btn">Copy_target</button>
   <div>hello</div>

   <script>
   var clipboard = new Clipboard('.btn', {
   // 通过target指定要复印的节点
       target: function() {
                  return document.querySelector('div');
             }
   });

   clipboard.on('success', function(e) {
       console.log(e);
   });

   clipboard.on('error', function(e) {
       console.log(e);
   });
   </script>
 
第二种：
 
通过text的function复印内容
 text的function指定的复印内容，这里返回‘to be or not to be’
 
<button class="btn">Copy</button>
<script>
   var clipboard = new Clipboard('.btn', {
   // 点击copy按钮，直接通过text直接返回复印的内容
       text: function() {
           return 'to be or not to be';
       }
   });

   clipboard.on('success', function(e) {
       console.log(e);
   });

   clipboard.on('error', function(e) {
       console.log(e);
});
 
 
（4）通过属性返回复印的内容
 
第一种： 单节点
 
通过id指定节点对象，并做为参数传送给Clipboard。这里的返回值的内容是data-clipboard-text的内容
 
// 通过id获取复制data-clipboard-text的内容 
<div id="btn" data-clipboard-text="1">
        <span>Copy</span>
</div>
 
<script>
    var btn = document.getElementById('btn');
    var clipboard = new Clipboard(btn);
 
    clipboard.on('success', function(e) {
        console.log(e);
    });
 
    clipboard.on('error', function(e) {
        console.log(e);
    });
</script>
 
第二种： 多节点
 
通过class获取所有button按钮，并做为参数传送给Clipboard。每个按钮被点击时，返回值的内容是其对应的data-clipboard-text的内容，分别是1，2，3
 
//   通过class注册多个button，获取data-clipboard-text的值
<button class="btn" data-clipboard-text="1">Copy</button>
    <button class="btn" data-clipboard-text="2">Copy</button>
    <button class="btn" data-clipboard-text="3">Copy</button>
 <script>
    var clipboard = new Clipboard('.btn');
 
    clipboard.on('success', function(e) {
        console.log(e);
    });
 
    clipboard.on('error', function(e) {
        console.log(e);
    });
    </script>
 
 
（5）函数和属性的兼容方式
 
函数：
 
//ClipboardJS.isSupported()　　//--------这句为：是否兼容
var clipboard = new Clipboard('.btn');
//优雅降级:safari 版本号>=10,提示复制成功;否则提示需在文字选中后，手动选择“拷贝”进行复制
clipboard.on('success', function(e) {
    alert('复制成功!')
    e.clearSelection();
});
clipboard.on('error', function(e) {
    alert('请选择“拷贝”进行复制!')
//尝试去掉alert，能弹出系统的“拷贝”工具，但是需要点击两次按钮才能弹出，具体原因还不清楚，参考上图。有人说可以试一下在触发的地方写一个空点击事件, οnclick="" 因为ios不单纯支持on事件
}); 
 
属性：
 
<img
   src="../../../../assets/images/zuop_award/copy_link.png"
      @click="copy"
      data-clipboard-action="copy"
      class="email"
      :data-clipboard-text="'mayouchen@csdn.com'"
    /> 

-------------------
  copy() {
     var clipboard = new Clipboard(".email")
     // console.log(clipboard);
     clipboard.on("success", e => {
       // console.log("复制成功", e);
       Toast({
         message: "复制成功"
       })
       // 释放内存
       clipboard.destroy()
     })
     clipboard.on("error", e => {
       // 不支持复制
       Toast({
         message: "手机权限不支持复制功能"
       })
       console.log("该浏览器不支持自动复制")
       // 释放内存
       clipboard.destroy()
     })
   }

 
A polyfill for the asynchronous clipboard API
 

 
clipboard-polyfill
 
Make copying on the web as easy as:
 
clipboard.writeText("hello world");
 
As of October 2017, this library is a polyfill for the modern Promise-based asynchronous clipboard API.
 
Why clipboard-polyfill?
 
Browsers have implemented several clipboard APIs over time, and writing to the clipboard without triggering bugs in various old and current browsers is fairly tricky. In every browser that supports copying to the clipboard in some way, clipboard-polyfill attempts to act as close as possible to the async clipboard API. (Read to the end of this document for all the limitations.)
 
Note: If you only need to copy text and want a super simple polyfill that gets you 80% of the way, consider using this gist.
 
Get the Code
 
Get the code using one of the following. If you don't know how to pick and want maximum browser compatibility, start by using "With Promise Polyfill".
 
Without Promise Polyfill
 
This version is smaller, but does not work in Internet Explorer unless you add your own Promise polyfill (see below).
 
Download dist/clipboard-polyfill.js and include it using a 
 
npm install clipboard-polyfill and one of:import * as clipboard from "clipboard-polyfill"
 
const clipboard = require("clipboard-polyfill");
 
With Promise Polyfill
 
This version works "out of the box" in all browsers that support copying to the clipboard, but is about 2.5x as large.
 
Download dist/clipboard-polyfill.promise.js and include it using a 
 
npm install clipboard-polyfill and one of:import * as clipboard from "clipboard-polyfill/dist/clipboard-polyfill.promise"
 
const clipboard = require("clipboard-polyfill/dist/clipboard-polyfill.promise");
 
Which One?
 
The async clipboard API design uses ES6 Promise, which is not supported in Internet Explorer. If you want the clipboard-polyfill to work in as many browsers as possible, you will need to include a polyfill for Promise. You can do this by either using the "With Promise Polyfill" version, or by using the "Without Promise Polyfill" version with a polyfill of your own choice. Recommendations include es6-promise and core-js. Instructions for how to use these polyfills are dependent on your build system and can be found in the READMEs of these libraries.
 
Usage
 
Plain Text
 
Copy text to the clipboard (all modern browsers):
 
clipboard.writeText("This text is plain.");
 
Read text from the clipboard (IE 9-11 and Chrome 65+):
 
clipboard.readText().then(console.log, console.error);
 
Caveats:
 
Browsers may require a user gesture or user permission to access the clipboard. In particular, you should write text only in response to an event listener, e.g. a button click listener.
 
Reading fails if the clipboard does not contain text/plain data.
 
Other Data Types (e.g. HTML)
 
Write (all modern browsers):
 
var dt = new clipboard.DT();
 
dt.setData("text/plain", "Fallback markup text.");
 
dt.setData("text/html", "Markup text.");
 
clipboard.write(dt);
 
Read (IE 9-11, Chrome 65+):
 
// The success callback receives a clipboard.DT object.
 
clipboard.read().then(console.log, console.error);
 
Caveats:
 
Currently, text/plain and text/html are the only data types that can be written to the clipboard across most browsers.
 
Unsupported data types will be silently dropped. In general, it is not possible to tell which data types will be dropped.
 
This part of the clipboard API is still under active discussion, and may change.
 
Currently, reading will only return the text/plain data type, if it is on the clipboard.
 
Interface
 
clipboard {
 
static write: (data: clipboard.DT) => Promise
 
static writeText: (s: string) => Promise
 
static read: () => Promise
 
static readText: () => Promise
 
static suppressWarnings: () => void
 
}
 
clipboard.DT {
 
constructor()
 
setData: (type: string, value: string): void
 
getData: (type: string): string | undefined
 
}
 
A note on clipboard.DT
 
The asynchronous clipboard API works like this:
 
var dt = new DataTransfer();
 
dt.setData("text/plain", "plain text");
 
navigator.clipboard.write(dt);
 
Ideally, clipboard-polyfill would take a DataTransfer, so that the code above works verbatim when you replace navigator.clipboard with clipboard. However, the DataTransfer constructor cannot be called in most browsers. Thus, this library uses a light-weight alternative to DataTransfer, exposed as clipboard.DT:
 
var dt = new clipboard.DT();
 
dt.setData("text/plain", "plain text");
 
clipboard.write(dt);
 
This is way too complicated!
 
Try this gist for a simpler solution.
 
Chrome 42+
 
Firefox 41+
 
Opera 29+
 
Internet Explorer 9+ (text only)
 
Edge
 
Desktop Safari 10+
 
iOS Safari 10+ (text only in some versions)
 
clipboard-polyfill uses a variety of heuristics to get around compatibility bugs. Please let us know if you are running into compatibility issues with any of the browsers listed above.
 
Limitations
 
In Microsoft Edge, it seems to be impossible to detect whether the copy action actually succeeded (Edge Bug #14110451, Edge Bug #14080262). clipboard-polyfill will always call resolve() in Edge.
 
In Microsoft Edge, only the last data type you specify is copied to the clipboard (Edge Bug #14080506).DataTransfer and clipboard.DT keep track of the order in which you set items. If you care which data type Edge copies, call setData() with that data type last.
 
On iOS Safari (WebKit Bug #177715) and Internet Explorer, only text copying works.On iOS Safari, clipboard-polyfill needs to use the DOM to copy, so the text will be copied as rich text. clipboard-polyfill attempts to use shadow DOM in order to avoid some of the page formatting (e.g. background color) from affecting the copied text. However, such formatting might be copied if shadow DOM is not available.
 
In other browsers, writing copy data that does not include the text/plain data type will succeed, but also show a console warning:
 
clipboard.write() was called without a text/plain data type. On some platforms, this may result in an empty clipboard. Call clipboard.suppressWarnings() to suppress this warning.
 
clipboard-polyfill attemps to avoid changing the document selection or modifying the DOM. However, clipboard-polyfill will automatically fall back to using such techniques if needed:On iOS Safari, the user's current selection will be cleared. This should not happen on other platforms unless there are unanticipated bugs. (Please file an issue if you observe this!)
 
On iOS Safari and under certain conditions on desktop Safari (WebKit Bug #177715), clipboard-polyfill needs to add a temporary element to the DOM. This will trigger a mutation observer if you have attached one to document.body. Please file an issue if you'd like to discuss how to detect temporary elements added by clipboard-polyfill.
 
read() currently only works in Internet Explorer.Internet Explorer can only read text/plain values from the clipboard.
 
Microsoft Edge (at least EdgeHTML version <17) does not write text/html to the clipboard using the Windows CF_HTML clipboard format (Edge Bug #14372529), which prevents other programs (including other browsers) from recognizing the copied HTML data (issue #73). clipboard-polyfill currently does not attempt to work around this issue.
 
Node with --experimental-modules seems to require using import clipboard from "clipboard-polyfill" (instead of import * from) as of October 2018. Some environments may also require this.
 
Repository

 
Clipboard Events spec
 
This repository contains the specification for Clipboard Events.
 
Tests for the spec are maintained inside the source code of the spec itself. They are extracted and built into a test suite by running TC-generator/tc-gen.py. When web-platform-tests/pull/1242 is done, the tests will live in the web-platform-tests repo.
 
Contributions welcome - both tests and suggested edits.
 
Because this specification is written using Bikeshed, all edits should be made to the index.bs file.
 
The index.html file can then be generated by running the bikeshed command (with no arguements) in the repo directory.
 
If you cannot run Bikeshed, you can still submit pull requests with edits to just the bikeshed.bs file and someone will follow up with a CL that generates the appropriate HTML.
 
This specification formerly used W3C's CVS repository but that repo is no longer used for this specification.