qt - How to force QAbstractItemView recalculate items sizeHints -

-

i have qlistview , qtabwidget inside qsplitter. qlistview using custom model , custom delegates. in delegate reimplemented paint , sizehint methods. when resize view - height of elements doesn't recalculated. how can fix it? sample images: before resizingafter resizing

in google found possible emit layoutchanged model, want current view updated, because content of model doesn't change.

delegate code:

void chatitemdelegate::paint( qpainter *painter, const qstyleoptionviewitem& option, const qmodelindex& index ) const {     painter->save();      chatitem *item = static_cast< chatitem * >( index.internalpointer() );     qtextdocument doc;      doc.sethtml( item->htmltext() );     doc.settextwidth( option.rect.width() );      qrect clip( 0, 0, option.rect.width(), option.rect.height() );     painter->translate( option.rect.topleft() );      qcolor bgcolor = index.row() % 2 ? qcolor( 255, 0, 0, 40 ) : qcolor( 0, 255, 0, 40 );     painter->fillrect( clip, bgcolor );     doc.drawcontents( painter, clip );      qdebug() << "paint: " << option.rect.width() << " idx: " << index.row();      painter->restore(); }  qsize chatitemdelegate::sizehint( const qstyleoptionviewitem& option, const qmodelindex& index ) const {     chatitem *item = static_cast< chatitem * >( index.internalpointer() );     qtextdocument doc;      doc.sethtml( item->htmltext() );     doc.settextwidth( option.rect.width() );      qdebug() << "hint:  " << option.rect.width() << " idx: " << index.row();      return doc.size().tosize(); }

similar question

this bit of guess, setting qlistview's resize mode help?

listview->setresizemode( qlistview::adjust );

Comments

Post a Comment

Popular posts from this blog

java - Jmockit String final length method mocking Issue -

-
using jmockit 1.2 jar, trying mock string's length method getting unexpected invocation exception: failed: test java.lang.illegalstateexception: missing invocation mocked type @ point; please make sure such invocations appear after declaration of suitable mock field or parameter @ stringdemo.testa$1.<init>(testa.java:17) @ stringdemo.testa.test(testa.java:13) i using testng: @test public void test() throws exception { new expectations() { @mocked("length") string astring; { astring.length(); result = 2; } }; system.out.println(a.showa("test")); } } actual class a: public class { public static int showa(string str){ int a= str.length(); return a; } } this wrong way of recording expected results. shouldn't mock , record string's length() method, record showa() instead. here solution @suppresswarnings("unused...
Read more

What is the difference between data design and data model(ERD) -

-
i have google question , find answer in day. know, data design many many table have list column,and mark pk , fk. why er-diagram have find this? data design process of designing database. main output of data design detailed logical data model of database. some people data design includes of needed logical , physical design choices , physical storage parameters needed generate design in data definition language. technically, database analysis, database analysts (dbas) trained do. while person can both data design , database analysis, these 2 different tasks. data design models data. database analysis takes model , applies 1 or more database engines (relational, hierarchical, nosql). a logical data model 1 of main outputs of data design. data model represented entity relationship diagram, or er diagram.
Read more

ios - Can NSManagedObject conform to NSCoding -

-
i need transfer single object across device. right converting nsmanagedobject dictionary , archiving , sending nsdata. upon receiving unarchiving it. transfer nsmanagedobject archiving , unarchiving instead of creating intermediate data object. @interface test : nsmanagedobject<nscoding> @property (nonatomic, retain) nsstring * title; @end @implementation test @dynamic title; - (id)initwithcoder:(nscoder *)coder { self = [super init]; if (self) { self.title = [coder decodeobjectforkey:@"title"]; //<crash } return self; } - (void)encodewithcoder:(nscoder *)coder { [coder encodeobject:self.title forkey:@"title"]; } @end nsdata *archivedobjects = [nskeyedarchiver archiveddatawithrootobject:testobj]; nsdata *objectsdata = archivedobjects; if ([objectsdata length] > 0) { nsarray *objects = [nskeyedunarchiver unarchiveobjectwithdata:objectsdata]; } the problem above code is. crashes @ self.title in initwithcoder sa...
Read more