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<h1>eric7.HelpViewer.HelpViewerImplQTB</h1>

<p>
Module implementing the QTextBrowser based help viewer class.
</p>
<h3>Global Attributes</h3>

<table>
<tr><td>AboutBlank</td></tr><tr><td>PageNotFound</td></tr>
</table>
<h3>Classes</h3>

<table>

<tr>
<td><a href="#HelpViewerImplQTB">HelpViewerImplQTB</a></td>
<td>Class implementing the QTextBrowser based help viewer class.</td>
</tr>
</table>
<h3>Functions</h3>

<table>
<tr><td>None</td></tr>
</table>
<hr />
<hr />
<a NAME="HelpViewerImplQTB" ID="HelpViewerImplQTB"></a>
<h2>HelpViewerImplQTB</h2>

<p>
    Class implementing the QTextBrowser based help viewer class.
</p>
<h3>Derived from</h3>
HelpViewerImpl, QTextBrowser
<h3>Class Attributes</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Class Methods</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>

<table>

<tr>
<td><a href="#HelpViewerImplQTB.__init__">HelpViewerImplQTB</a></td>
<td>Constructor</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.__canLoadResource">__canLoadResource</a></td>
<td>Private method to check, if the given resource can be loaded.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.__closeOtherPages">__closeOtherPages</a></td>
<td>Private method called by the context menu to close all other pages.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.__closePage">__closePage</a></td>
<td>Private method called by the context menu to close the current page.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.__copyLink">__copyLink</a></td>
<td>Private method called by the context menu to copy a link to the clipboard.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.__createLinkContextMenu">__createLinkContextMenu</a></td>
<td>Private method to populate the context menu for URLs.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.__openLinkInBackgroundPage">__openLinkInBackgroundPage</a></td>
<td>Private method called by the context menu to open a link in a background page.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.__openLinkInNewPage">__openLinkInNewPage</a></td>
<td>Private method called by the context menu to open a link in a new page.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.__showContextMenu">__showContextMenu</a></td>
<td>Private slot to show the context menu.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.doSetSource">doSetSource</a></td>
<td>Public method to load the data and show it.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.event">event</a></td>
<td>Public method handling events.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.gestureEvent">gestureEvent</a></td>
<td>Protected method handling gesture events.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.gotoHistory">gotoHistory</a></td>
<td>Public method to step through the history.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.isBackwardAvailable">isBackwardAvailable</a></td>
<td>Public method to check, if stepping backward through the history is available.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.isEmptyPage">isEmptyPage</a></td>
<td>Public method to check, if the current page is the empty page.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.isForwardAvailable">isForwardAvailable</a></td>
<td>Public method to check, if stepping forward through the history is available.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.isScaleDownAvailable">isScaleDownAvailable</a></td>
<td>Public method to check, if the min.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.isScaleUpAvailable">isScaleUpAvailable</a></td>
<td>Public method to check, if the max.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.keyPressEvent">keyPressEvent</a></td>
<td>Protected method to handle key press events.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.link">link</a></td>
<td>Public method to get the URL of the shown document.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.loadResource">loadResource</a></td>
<td>Public method to load data of the specified type from the resource with the given name.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.mousePressEvent">mousePressEvent</a></td>
<td>Protected method called by a mouse press event.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.mouseReleaseEvent">mouseReleaseEvent</a></td>
<td>Protected method called by a mouse release event.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.pageTitle">pageTitle</a></td>
<td>Public method get the page title.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.resetScale">resetScale</a></td>
<td>Public method to reset the zoom level.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.scale">scale</a></td>
<td>Public method to get the zoom level.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.scaleDown">scaleDown</a></td>
<td>Public method to zoom out.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.scaleUp">scaleUp</a></td>
<td>Public method to zoom in.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.setLink">setLink</a></td>
<td>Public method to set the URL of the document to be shown.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.setScale">setScale</a></td>
<td>Public method to set the zoom level.</td>
</tr>
<tr>
<td><a href="#HelpViewerImplQTB.wheelEvent">wheelEvent</a></td>
<td>Protected method to handle wheel event to zoom.</td>
</tr>
</table>
<h3>Static Methods</h3>

<table>
<tr><td>None</td></tr>
</table>

<a NAME="HelpViewerImplQTB.__init__" ID="HelpViewerImplQTB.__init__"></a>
<h4>HelpViewerImplQTB (Constructor)</h4>
<b>HelpViewerImplQTB</b>(<i>engine, parent=None</i>)

<p>
        Constructor
</p>
<dl>

<dt><i>engine</i> (QHelpEngine)</dt>
<dd>
reference to the help engine
</dd>
<dt><i>parent</i> (QWidget)</dt>
<dd>
reference to the parent widget
</dd>
</dl>
<a NAME="HelpViewerImplQTB.__canLoadResource" ID="HelpViewerImplQTB.__canLoadResource"></a>
<h4>HelpViewerImplQTB.__canLoadResource</h4>
<b>__canLoadResource</b>(<i>url</i>)

<p>
        Private method to check, if the given resource can be loaded.
</p>
<dl>

<dt><i>url</i> (QUrl)</dt>
<dd>
URL of resource to be loaded
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
flag indicating, that the given URL can be handled
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="HelpViewerImplQTB.__closeOtherPages" ID="HelpViewerImplQTB.__closeOtherPages"></a>
<h4>HelpViewerImplQTB.__closeOtherPages</h4>
<b>__closeOtherPages</b>(<i></i>)

<p>
        Private method called by the context menu to close all other pages.
</p>
<a NAME="HelpViewerImplQTB.__closePage" ID="HelpViewerImplQTB.__closePage"></a>
<h4>HelpViewerImplQTB.__closePage</h4>
<b>__closePage</b>(<i></i>)

<p>
        Private method called by the context menu to close the current page.
</p>
<a NAME="HelpViewerImplQTB.__copyLink" ID="HelpViewerImplQTB.__copyLink"></a>
<h4>HelpViewerImplQTB.__copyLink</h4>
<b>__copyLink</b>(<i>act</i>)

<p>
        Private method called by the context menu to copy a link to the
        clipboard.
</p>
<dl>

<dt><i>act</i> (QAction)</dt>
<dd>
reference to the action that triggered
</dd>
</dl>
<a NAME="HelpViewerImplQTB.__createLinkContextMenu" ID="HelpViewerImplQTB.__createLinkContextMenu"></a>
<h4>HelpViewerImplQTB.__createLinkContextMenu</h4>
<b>__createLinkContextMenu</b>(<i>menu, linkUrl</i>)

<p>
        Private method to populate the context menu for URLs.
</p>
<dl>

<dt><i>menu</i> (QMenu)</dt>
<dd>
reference to the menu to be populated
</dd>
<dt><i>linkUrl</i> (QUrl)</dt>
<dd>
URL to create the menu part for
</dd>
</dl>
<a NAME="HelpViewerImplQTB.__openLinkInBackgroundPage" ID="HelpViewerImplQTB.__openLinkInBackgroundPage"></a>
<h4>HelpViewerImplQTB.__openLinkInBackgroundPage</h4>
<b>__openLinkInBackgroundPage</b>(<i>act</i>)

<p>
        Private method called by the context menu to open a link in a
        background page.
</p>
<dl>

<dt><i>act</i> (QAction)</dt>
<dd>
reference to the action that triggered
</dd>
</dl>
<a NAME="HelpViewerImplQTB.__openLinkInNewPage" ID="HelpViewerImplQTB.__openLinkInNewPage"></a>
<h4>HelpViewerImplQTB.__openLinkInNewPage</h4>
<b>__openLinkInNewPage</b>(<i>act</i>)

<p>
        Private method called by the context menu to open a link in a new page.
</p>
<dl>

<dt><i>act</i> (QAction)</dt>
<dd>
reference to the action that triggered
</dd>
</dl>
<a NAME="HelpViewerImplQTB.__showContextMenu" ID="HelpViewerImplQTB.__showContextMenu"></a>
<h4>HelpViewerImplQTB.__showContextMenu</h4>
<b>__showContextMenu</b>(<i>pos</i>)

<p>
        Private slot to show the context menu.
</p>
<dl>

<dt><i>pos</i> (QPoint)</dt>
<dd>
position to show the context menu at
</dd>
</dl>
<a NAME="HelpViewerImplQTB.doSetSource" ID="HelpViewerImplQTB.doSetSource"></a>
<h4>HelpViewerImplQTB.doSetSource</h4>
<b>doSetSource</b>(<i>url, type_</i>)

<p>
        Public method to load the data and show it.
</p>
<dl>

<dt><i>url</i> (QUrl)</dt>
<dd>
URL of resource to load
</dd>
<dt><i>type_</i> (QTextDocument.ResourceType)</dt>
<dd>
type of the resource to load
</dd>
</dl>
<a NAME="HelpViewerImplQTB.event" ID="HelpViewerImplQTB.event"></a>
<h4>HelpViewerImplQTB.event</h4>
<b>event</b>(<i>evt</i>)

<p>
        Public method handling events.
</p>
<dl>

<dt><i>evt</i> (QEvent)</dt>
<dd>
reference to the event
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
flag indicating the event was handled
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="HelpViewerImplQTB.gestureEvent" ID="HelpViewerImplQTB.gestureEvent"></a>
<h4>HelpViewerImplQTB.gestureEvent</h4>
<b>gestureEvent</b>(<i>evt</i>)

<p>
        Protected method handling gesture events.
</p>
<dl>

<dt><i>evt</i> (QGestureEvent)</dt>
<dd>
reference to the gesture event
</dd>
</dl>
<a NAME="HelpViewerImplQTB.gotoHistory" ID="HelpViewerImplQTB.gotoHistory"></a>
<h4>HelpViewerImplQTB.gotoHistory</h4>
<b>gotoHistory</b>(<i>index</i>)

<p>
        Public method to step through the history.
</p>
<dl>

<dt><i>index</i> (int)</dt>
<dd>
history index (<0 backward, >0 forward)
</dd>
</dl>
<a NAME="HelpViewerImplQTB.isBackwardAvailable" ID="HelpViewerImplQTB.isBackwardAvailable"></a>
<h4>HelpViewerImplQTB.isBackwardAvailable</h4>
<b>isBackwardAvailable</b>(<i></i>)

<p>
        Public method to check, if stepping backward through the history is
        available.
</p>
<dl>
<dt>Return:</dt>
<dd>
flag indicating backward stepping is available
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="HelpViewerImplQTB.isEmptyPage" ID="HelpViewerImplQTB.isEmptyPage"></a>
<h4>HelpViewerImplQTB.isEmptyPage</h4>
<b>isEmptyPage</b>(<i></i>)

<p>
        Public method to check, if the current page is the empty page.
</p>
<dl>
<dt>Return:</dt>
<dd>
flag indicating an empty page is loaded
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="HelpViewerImplQTB.isForwardAvailable" ID="HelpViewerImplQTB.isForwardAvailable"></a>
<h4>HelpViewerImplQTB.isForwardAvailable</h4>
<b>isForwardAvailable</b>(<i></i>)

<p>
        Public method to check, if stepping forward through the history is
        available.
</p>
<dl>
<dt>Return:</dt>
<dd>
flag indicating forward stepping is available
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="HelpViewerImplQTB.isScaleDownAvailable" ID="HelpViewerImplQTB.isScaleDownAvailable"></a>
<h4>HelpViewerImplQTB.isScaleDownAvailable</h4>
<b>isScaleDownAvailable</b>(<i></i>)

<p>
        Public method to check, if the min. zoom level is reached.
</p>
<dl>
<dt>Return:</dt>
<dd>
flag indicating scale down is available
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="HelpViewerImplQTB.isScaleUpAvailable" ID="HelpViewerImplQTB.isScaleUpAvailable"></a>
<h4>HelpViewerImplQTB.isScaleUpAvailable</h4>
<b>isScaleUpAvailable</b>(<i></i>)

<p>
        Public method to check, if the max. zoom level is reached.
</p>
<dl>
<dt>Return:</dt>
<dd>
flag indicating scale up is available
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
bool
</dd>
</dl>
<a NAME="HelpViewerImplQTB.keyPressEvent" ID="HelpViewerImplQTB.keyPressEvent"></a>
<h4>HelpViewerImplQTB.keyPressEvent</h4>
<b>keyPressEvent</b>(<i>evt</i>)

<p>
        Protected method to handle key press events.
</p>
<dl>

<dt><i>evt</i> (QKeyEvent)</dt>
<dd>
reference to the key event
</dd>
</dl>
<a NAME="HelpViewerImplQTB.link" ID="HelpViewerImplQTB.link"></a>
<h4>HelpViewerImplQTB.link</h4>
<b>link</b>(<i></i>)

<p>
        Public method to get the URL of the shown document.
</p>
<dl>
<dt>Return:</dt>
<dd>
URL of the document
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
QUrl
</dd>
</dl>
<a NAME="HelpViewerImplQTB.loadResource" ID="HelpViewerImplQTB.loadResource"></a>
<h4>HelpViewerImplQTB.loadResource</h4>
<b>loadResource</b>(<i>type_, name</i>)

<p>
        Public method to load data of the specified type from the resource with
        the given name.
</p>
<dl>

<dt><i>type_</i> (int)</dt>
<dd>
resource type
</dd>
<dt><i>name</i> (QUrl)</dt>
<dd>
resource name
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
byte array containing the loaded data
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
QByteArray
</dd>
</dl>
<a NAME="HelpViewerImplQTB.mousePressEvent" ID="HelpViewerImplQTB.mousePressEvent"></a>
<h4>HelpViewerImplQTB.mousePressEvent</h4>
<b>mousePressEvent</b>(<i>evt</i>)

<p>
        Protected method called by a mouse press event.
</p>
<dl>

<dt><i>evt</i> (QMouseEvent)</dt>
<dd>
reference to the mouse event
</dd>
</dl>
<a NAME="HelpViewerImplQTB.mouseReleaseEvent" ID="HelpViewerImplQTB.mouseReleaseEvent"></a>
<h4>HelpViewerImplQTB.mouseReleaseEvent</h4>
<b>mouseReleaseEvent</b>(<i>evt</i>)

<p>
        Protected method called by a mouse release event.
</p>
<dl>

<dt><i>evt</i> (QMouseEvent)</dt>
<dd>
reference to the mouse event
</dd>
</dl>
<a NAME="HelpViewerImplQTB.pageTitle" ID="HelpViewerImplQTB.pageTitle"></a>
<h4>HelpViewerImplQTB.pageTitle</h4>
<b>pageTitle</b>(<i></i>)

<p>
        Public method get the page title.
</p>
<dl>
<dt>Return:</dt>
<dd>
page title
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
str
</dd>
</dl>
<a NAME="HelpViewerImplQTB.resetScale" ID="HelpViewerImplQTB.resetScale"></a>
<h4>HelpViewerImplQTB.resetScale</h4>
<b>resetScale</b>(<i></i>)

<p>
        Public method to reset the zoom level.
</p>
<a NAME="HelpViewerImplQTB.scale" ID="HelpViewerImplQTB.scale"></a>
<h4>HelpViewerImplQTB.scale</h4>
<b>scale</b>(<i></i>)

<p>
        Public method to get the zoom level.
</p>
<dl>
<dt>Return:</dt>
<dd>
current zoom level
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
int
</dd>
</dl>
<a NAME="HelpViewerImplQTB.scaleDown" ID="HelpViewerImplQTB.scaleDown"></a>
<h4>HelpViewerImplQTB.scaleDown</h4>
<b>scaleDown</b>(<i></i>)

<p>
        Public method to zoom out.
</p>
<a NAME="HelpViewerImplQTB.scaleUp" ID="HelpViewerImplQTB.scaleUp"></a>
<h4>HelpViewerImplQTB.scaleUp</h4>
<b>scaleUp</b>(<i></i>)

<p>
        Public method to zoom in.
</p>
<a NAME="HelpViewerImplQTB.setLink" ID="HelpViewerImplQTB.setLink"></a>
<h4>HelpViewerImplQTB.setLink</h4>
<b>setLink</b>(<i>url</i>)

<p>
        Public method to set the URL of the document to be shown.
</p>
<dl>

<dt><i>url</i> (QUrl)</dt>
<dd>
source of the document
</dd>
</dl>
<a NAME="HelpViewerImplQTB.setScale" ID="HelpViewerImplQTB.setScale"></a>
<h4>HelpViewerImplQTB.setScale</h4>
<b>setScale</b>(<i>scale</i>)

<p>
        Public method to set the zoom level.
</p>
<dl>

<dt><i>scale</i> (int)</dt>
<dd>
zoom level to set
</dd>
</dl>
<a NAME="HelpViewerImplQTB.wheelEvent" ID="HelpViewerImplQTB.wheelEvent"></a>
<h4>HelpViewerImplQTB.wheelEvent</h4>
<b>wheelEvent</b>(<i>evt</i>)

<p>
        Protected method to handle wheel event to zoom.
</p>
<dl>

<dt><i>evt</i> (QWheelEvent)</dt>
<dd>
reference to the event object
</dd>
</dl>
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