<div dir="ltr">Hi All, <div><br></div><div><br></div><div>I use mapCanvas().setRenderFlag( <span class="gmail-pl-c1">False</span> ) before loading a (potentially) large number of layers using the 'Load Them All' plugin [1]. I acknowledge I needed to toggle such flag years ago (the plugin was mainly developed in 2012) and still use it. </div><div><br></div><div>For another plugin (private according to requirements from a company), I use heavy PostGIS layers in a Processing workflow. As I don't want the canvas to show anything in the meantime (I'm only interested in getting progress bar updates in QgsMessageBar), I use the setRenderFlag(False) and only ask canvas to show all needed layers, including results, after all processing is done.</div><div><br></div><div>Does it make sense or could I avoid toggling the flag?</div><div><br></div><div><br></div><div>Regards, </div><div><br></div><div>Germán</div><div>----</div><div>[1] <a href="http://plugins.qgis.org/plugins/loadthemall/">http://plugins.qgis.org/plugins/loadthemall/</a></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-02-28 6:49 GMT-05:00 Tim Sutton <span dir="ltr"><<a href="mailto:tim@kartoza.com" target="_blank">tim@kartoza.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi<div><br><div><span class=""><blockquote type="cite"><div>On 28 Feb 2017, at 12:00 PM, Matthias Kuhn <<a href="mailto:matthias@opengis.ch" target="_blank">matthias@opengis.ch</a>> wrote:</div><br class="m_1036930757610947209Apple-interchange-newline"><div><div>Hi Tim<br><br>On 02/28/2017 10:42 AM, Tim Sutton wrote:<br><blockquote type="cite">One reason to keep it: For us the use case has often been when you are<br>doing first set up of a project and you are dropping a bunch of large<br>layers yet. You want to set up scale dependent visibility and rules<br>first without waiting for time consuming renders, then enable rendering<br>when everything is added. I know we can also use the option to make<br>layers not visible when they are first added to the canvas so I reckon<br>that use case can be worked around easily enough.<br></blockquote><br>Sorry if I'm missing something, but why is it important that in this<br>case nothing is rendered? I imagine you can just configure scale<br>dependent rendering, while ignoring that something is rendered in the<br>background. And once you apply the changed config, rendering will<br>restart with the same net-time and net-result (but less clicks).<br></div></div></blockquote><div><br></div><div><br></div></span><div>Hmm probably not so important if it is rendering nicely in a side thread and esc cancels rendering efficiently. Anyway it seems that others like Giovanni and Denis are quite invested in the feature so probably it is more useful to understand their needs as I could easily see it go and not be too worried...</div><div><br></div><div>Regards</div><div><br></div><div>Tim</div><div><br></div><br><blockquote type="cite"><div><div><br>Matthias<br></div></div></blockquote></div><br><div>
<div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-weight:normal;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;line-height:normal;text-align:center"><span>—</span></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;line-height:normal;text-align:center"><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br></div><br class="m_1036930757610947209Apple-interchange-newline" style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span><span><span><span><span><img id="m_1036930757610947209328297DB-C48A-46DE-B38B-DCF89BA95CFF" src="cid:1A5DF6DE-E302-4C28-BFBD-29663CBF1351"></span><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br class="m_1036930757610947209Apple-interchange-newline"><br class="m_1036930757610947209Apple-interchange-newline"><br class="m_1036930757610947209Apple-interchange-newline"><br class="m_1036930757610947209Apple-interchange-newline"><br class="m_1036930757610947209Apple-interchange-newline"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Tim Sutton</b></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Co-founder:</b><span class="m_1036930757610947209Apple-converted-space"> </span>Kartoza</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Project chair:</b><span style="font-weight:normal"><span class="m_1036930757610947209Apple-converted-space"> </span><a href="http://QGIS.org" target="_blank">QGIS.org</a></span></div><span class=""><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Visit <a href="http://kartoza.com/" target="_blank"><span>http://kartoza.com</span></a> to find out about open source:</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br></div></span><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Desktop GIS programming services</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Geospatial web development</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">GIS Training</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Consulting Services</div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Skype</b>: timlinux </div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>IRC:</b><span class="m_1036930757610947209Apple-converted-space"> </span>timlinux on #qgis at <a href="http://freenode.net" target="_blank">freenode.net</a></div><span class=""><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><br></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Kartoza is a merger between Linfiniti and Afrispatial</div>
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