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<a href="../modules.html">VS Code API</a>
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<li>
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<a href="WebviewViewResolveContext.html">WebviewViewResolveContext</a>
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</li>
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</ul>
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<h1>Interface WebviewViewResolveContext<T></h1>
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</div>
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<div class="tsd-comment tsd-typography">
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<div class="lead">
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<p>Additional information the webview view being resolved.</p>
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</div>
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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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<ul class="tsd-type-parameters">
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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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</section>
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<section class="tsd-panel tsd-hierarchy">
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<h3>Hierarchy</h3>
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<ul class="tsd-hierarchy">
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<li>
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<span class="target">WebviewViewResolveContext</span>
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</li>
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</ul>
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</section>
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<section class="tsd-panel-group tsd-index-group">
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<h2>Index</h2>
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<section class="tsd-panel tsd-index-panel">
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<div class="tsd-index-content">
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<section class="tsd-index-section ">
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<h3>Properties</h3>
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<ul class="tsd-index-list">
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<li class="tsd-kind-property tsd-parent-kind-interface"><a href="WebviewViewResolveContext.html#state" class="tsd-kind-icon">state</a></li>
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</section>
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</section>
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<section class="tsd-panel-group tsd-member-group ">
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<h2>Properties</h2>
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<section class="tsd-panel tsd-member tsd-kind-property tsd-parent-kind-interface">
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<a name="state" class="tsd-anchor"></a>
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<h3><span class="tsd-flag ts-flagReadonly">Readonly</span> state</h3>
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<div class="tsd-signature tsd-kind-icon">state<span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">undefined</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">T</span></div>
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<aside class="tsd-sources">
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<ul>
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<li>Defined in <a href="https://github.com/youngjuning/vscode-api/blob/c713f4c/vscode.d.ts#L7789">vscode.d.ts:7789</a></li>
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<div class="tsd-comment tsd-typography">
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<div class="lead">
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<p>Persisted state from the webview content.</p>
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</div>
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<p>To save resources, the editor normally deallocates webview documents (the iframe content) that are not visible.
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For example, when the user collapse a view or switches to another top level activity in the sidebar, the
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<code>WebviewView</code> itself is kept alive but the webview's underlying document is deallocated. It is recreated when
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the view becomes visible again.</p>
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<p>You can prevent this behavior by setting <code>retainContextWhenHidden</code> in the <code>WebviewOptions</code>. However this
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increases resource usage and should be avoided wherever possible. Instead, you can use persisted state to
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save off a webview's state so that it can be quickly recreated as needed.</p>
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<p>To save off a persisted state, inside the webview call <code>acquireVsCodeApi().setState()</code> with
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any json serializable object. To restore the state again, call <code>getState()</code>. For example:</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>The editor ensures that the persisted state is saved correctly when a webview is hidden and across
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editor restarts.</p>
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