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<a href="vscode.WebviewPanelSerializer.html">WebviewPanelSerializer</a>
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<h1>Interface WebviewPanelSerializer<T></h1>
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</div>
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<p>Restore webview panels that have been persisted when vscode shuts down.</p>
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</div>
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<p>There are two types of webview persistence:</p>
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<ul>
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<li>Persistence within a session.</li>
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<li>Persistence across sessions (across restarts of the editor).</li>
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</ul>
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<p>A <code>WebviewPanelSerializer</code> is only required for the second case: persisting a webview across sessions.</p>
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<p>Persistence within a session allows a webview to save its state when it becomes hidden
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and restore its content from this state when it becomes visible again. It is powered entirely
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by the webview content itself. To save off a persisted state, call <code>acquireVsCodeApi().setState()</code> with
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any json serializable object. To restore the state again, call <code>getState()</code></p>
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<pre><code class="language-js"><span style="color: #008000">// Within the webview</span>
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<span style="color: #0000FF">const</span><span style="color: #000000"> </span><span style="color: #0070C1">vscode</span><span style="color: #000000"> = </span><span style="color: #795E26">acquireVsCodeApi</span><span style="color: #000000">();</span>
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<span style="color: #008000">// Get existing state</span>
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<span style="color: #0000FF">const</span><span style="color: #000000"> </span><span style="color: #0070C1">oldState</span><span style="color: #000000"> = </span><span style="color: #001080">vscode</span><span style="color: #000000">.</span><span style="color: #795E26">getState</span><span style="color: #000000">() || { </span><span style="color: #001080">value:</span><span style="color: #000000"> </span><span style="color: #098658">0</span><span style="color: #000000"> };</span>
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<span style="color: #008000">// Update state</span>
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<span style="color: #795E26">setState</span><span style="color: #000000">({ </span><span style="color: #001080">value:</span><span style="color: #000000"> </span><span style="color: #001080">oldState</span><span style="color: #000000">.</span><span style="color: #001080">value</span><span style="color: #000000"> + </span><span style="color: #098658">1</span><span style="color: #000000"> })</span>
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</code></pre>
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<p>A <code>WebviewPanelSerializer</code> extends this persistence across restarts of the editor. When the editor is shutdown,
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it will save off the state from <code>setState</code> of all webviews that have a serializer. When the
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webview first becomes visible after the restart, this state is passed to <code>deserializeWebviewPanel</code>.
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The extension can then restore the old <code>WebviewPanel</code> from this state.</p>
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</div>
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</section>
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<section class="tsd-panel tsd-type-parameters">
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<h3>Type parameters</h3>
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<li>
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<h4>T = <span class="tsd-signature-type">unknown</span></h4>
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<div class="tsd-comment tsd-typography">
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<div class="lead">
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<p>Type of the webview's state.</p>
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</div>
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</div>
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</li>
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</ul>
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<section class="tsd-panel tsd-hierarchy">
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<h3>层级</h3>
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<ul class="tsd-hierarchy">
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<li>
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<span class="target">WebviewPanelSerializer</span>
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<h2>索引</h2>
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<div class="tsd-index-content">
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<section class="tsd-index-section ">
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<h3>Methods（1）</h3>
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<ul class="tsd-index-list">
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<li class="tsd-kind-method tsd-parent-kind-interface"><a href="vscode.WebviewPanelSerializer.html#deserializeWebviewPanel" class="tsd-kind-icon">deserialize<wbr>Webview<wbr>Panel</a></li>
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<section class="tsd-panel-group tsd-member-group ">
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<h2>Methods（1）</h2>
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<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
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<a name="deserializeWebviewPanel" class="tsd-anchor"></a>
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<h3>deserialize<wbr>Webview<wbr>Panel</h3>
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<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
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<li class="tsd-signature tsd-kind-icon">deserialize<wbr>Webview<wbr>Panel<span class="tsd-signature-symbol">(</span>webviewPanel<span class="tsd-signature-symbol">: </span><a href="vscode.WebviewPanel.html" class="tsd-signature-type" data-tsd-kind="Interface">WebviewPanel</a>, state<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">T</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="Thenable.html" class="tsd-signature-type" data-tsd-kind="Interface">Thenable</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">></span></li>
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<ul>
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<li>Defined in <a href="https://github.com/vscode-cn/vscode-api-cn/blob/3de8600/vscode.d.ts#L7703">vscode.d.ts:7703</a></li>
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<div class="tsd-comment tsd-typography">
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<div class="lead">
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<p>Restore a webview panel from its serialized <code>state</code>.</p>
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</div>
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<p>Called when a serialized webview first becomes visible.</p>
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</div>
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<h4 class="tsd-parameters-title">Parameters</h4>
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<ul class="tsd-parameters">
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<li>
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<h5>webviewPanel: <a href="vscode.WebviewPanel.html" class="tsd-signature-type" data-tsd-kind="Interface">WebviewPanel</a></h5>
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<div class="tsd-comment tsd-typography">
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<p>Webview panel to restore. The serializer should take ownership of this panel. The
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serializer must restore the webview's <code>.html</code> and hook up all webview events.</p>
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<h5>state: <span class="tsd-signature-type">T</span></h5>
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<div class="tsd-comment tsd-typography">
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<p>Persisted state from the webview content.</p>
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<h4 class="tsd-returns-title">Returns <a href="Thenable.html" class="tsd-signature-type" data-tsd-kind="Interface">Thenable</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">></span></h4>
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<p>Thenable indicating that the webview has been fully restored.</p>
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