Overlay widget for Phonon VideoWidget: Difference between revisions

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If you need put any widget over VideoWidget with transparent background, you can’t do it so:
[[Category:HowTo]]<br />[[Category:Snippets]]
 
If you need put any widget over VideoWidget with transparent background, you can't do it so:
 
<code><br /> m_video = new Phonon::VideoWidget;<br /> …..<br /> QWebView *view = new QWebView(mVideo);<br /> view-&gt;setHtml(&quot;&lt;div style=quot;color:#FFFFFF;font-size:36px;quot;&gt;Hello Qt!&lt;/div&amp;gt;&quot;);
 
QPalette palette = view-&gt;page()<s>&gt;palette();<br /> palette.setBrush(QPalette::Base, Qt::transparent);<br /> view</s>&gt;setPalette(palette);
 
view-&gt;setAttribute(Qt::WA_OpaquePaintEvent, false);
 
m_video-&gt;show();<br /> m_video-&gt;resize(640, 480);
 
view-&gt;setFixedSize(m_video-&gt;width(), m_video-&gt;height());<br /></code>


You got black background for your widget, It happens because phonon backend might use ''XRender'' for video rendering.
You got black background for your widget, It happens because phonon backend might use ''XRender'' for video rendering.
Line 7: Line 19:
This is subclass of ''Phonon::VideoWidget'' with overrided events methods.
This is subclass of ''Phonon::VideoWidget'' with overrided events methods.


Usage example:<br />
<code>class OverlayedVideoWidget : public Phonon::VideoWidget<br />{<br />public:<br /> OverlayedVideoWidget(QWidget *parent = 0) :<br /> Phonon::VideoWidget(parent),<br /> m_overlayWidget(0)<br /> {<br /> }
 
void setOverlayWidget(QWidget *widget)<br /> {<br /> m_overlayWidget = widget;<br /> }
 
protected:<br /> void moveEvent(QMoveEvent *event)<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;move(event-&gt;pos());<br /> }
 
void resizeEvent(QResizeEvent '''event)<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;resize(event-&gt;size());<br /> }
<br /> void hideEvent(QHideEvent''')<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;hide();<br /> }
 
void showEvent(QShowEvent ''')<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;show();<br /> }
<br /> void closeEvent(QCloseEvent''')<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;close();<br /> }
 
private:<br /> QWidget *m_overlayWidget;<br />};</code>


Main idea of this workaround is set to overlayed widget ToolTip window flag and connect move, resize, etc events of both objects.
Usage example:<br /><code>m_video = new OverlayedVideoWidget;


===Categories:===
QWebView *view = new QWebView();<br />view-&gt;setHtml(&quot;&lt;div style=quot;color:#FFFFFF;font-size:36px;quot;&gt;Hello Qt!&lt;/div&amp;gt;&quot;);<br />QPalette palette = view-&gt;page()<s>&gt;palette();<br />palette.setBrush(QPalette::Base, Qt::transparent);
<br />view</s>&gt;setPalette(palette);<br />view-&gt;page()<s>&gt;setPalette(palette);<br />view</s>&gt;setAttribute(Qt::WA_OpaquePaintEvent, false);<br />view-&gt;setAttribute(Qt::WA_TranslucentBackground, true);<br />view-&gt;setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint);


* [[:Category:HowTo|HowTo]]
m_video-&gt;setOverlayWidget(view);<br />m_video-&gt;show();<br />m_video-&gt;resize(640, 480);</code>
* [[:Category:snippets|snippets]]

Revision as of 10:57, 24 February 2015


If you need put any widget over VideoWidget with transparent background, you can't do it so: 

<br /> m_video = new Phonon::VideoWidget;<br /> …..<br /> QWebView *view = new QWebView(mVideo);<br /> view-&gt;setHtml(&quot;&lt;div style=quot;color:#FFFFFF;font-size:36px;quot;&gt;Hello Qt!&lt;/div&amp;gt;&quot;);

QPalette palette = view-&gt;page()<s>&gt;palette();<br /> palette.setBrush(QPalette::Base, Qt::transparent);<br /> view</s>&gt;setPalette(palette);

view-&gt;setAttribute(Qt::WA_OpaquePaintEvent, false);

m_video-&gt;show();<br /> m_video-&gt;resize(640, 480);

view-&gt;setFixedSize(m_video-&gt;width(), m_video-&gt;height());<br />

You got black background for your widget, It happens because phonon backend might use XRender for video rendering.

Bellow example of workaround, which can help you:

This is subclass of Phonon::VideoWidget with overrided events methods. 

class OverlayedVideoWidget : public Phonon::VideoWidget<br />{<br />public:<br /> OverlayedVideoWidget(QWidget *parent = 0) :<br /> Phonon::VideoWidget(parent),<br /> m_overlayWidget(0)<br /> {<br /> }

void setOverlayWidget(QWidget *widget)<br /> {<br /> m_overlayWidget = widget;<br /> }

protected:<br /> void moveEvent(QMoveEvent *event)<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;move(event-&gt;pos());<br /> }

void resizeEvent(QResizeEvent '''event)<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;resize(event-&gt;size());<br /> }
<br /> void hideEvent(QHideEvent''')<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;hide();<br /> }

void showEvent(QShowEvent ''')<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;show();<br /> }
<br /> void closeEvent(QCloseEvent''')<br /> {<br /> if (m_overlayWidget)<br /> m_overlayWidget-&gt;close();<br /> }

private:<br /> QWidget *m_overlayWidget;<br />};

Usage example:

m_video = new OverlayedVideoWidget;

QWebView *view = new QWebView();<br />view-&gt;setHtml(&quot;&lt;div style=quot;color:#FFFFFF;font-size:36px;quot;&gt;Hello Qt!&lt;/div&amp;gt;&quot;);<br />QPalette palette = view-&gt;page()<s>&gt;palette();<br />palette.setBrush(QPalette::Base, Qt::transparent);
<br />view</s>&gt;setPalette(palette);<br />view-&gt;page()<s>&gt;setPalette(palette);<br />view</s>&gt;setAttribute(Qt::WA_OpaquePaintEvent, false);<br />view-&gt;setAttribute(Qt::WA_TranslucentBackground, true);<br />view-&gt;setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint);

m_video-&gt;setOverlayWidget(view);<br />m_video-&gt;show();<br />m_video-&gt;resize(640, 480);
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