Mixing
Is there a way to calculate the height of the QStandardItem?
-2
I have created an expandable ListView which extends from the QListView, everything works well when I just want to show the Header data (Item which is not expanded) because I gave it a hard-coded height which is 64, the details appear when expanding the item. But the problem is I do not know the exact height of the details because the details can one line or more, I want to fit the Item height according to the item content.
Here the code which is handling click listener when the item expanding or collapsing:
LogListItemDelegate *delegate = static_cast<LogListItemDelegate *>(itemDelegate());
QStandardItem *item = static_cast<QStandardItemModel *>(model())->itemFromIndex(index);
bool expand = delegate->isExpandable() && mapFromGlobal(QCursor::pos()).x() >= visualRect(index).width() - 48;
bool expanded = index.data(LogListItemDelegate::DT_Expanded).toBool();
// here the height returned is header height, no containing the details which it is in expanding mode
int height = item->sizeHint().height();
if (!expanded) {
item->setData(true, LogListItemDelegate::DT_Expanded);
item->setSizeHint(QSize(0, 150)); // 150 here must be dynamically calculated
} else {
item->setData(false, LogListItemDelegate::DT_Expanded);
item->setSizeHint(QSize(0, 64)); // 64 is the header height, no prolem
}
Now the question is: How to calculate the height when item expanded?
Result:
Edit:
It is when I want to add the message to the list
void LogListView::addMessage(const QJsonObject &msg, const bool append)
{
static int id = 1; // unique id for log items
auto *item = new QStandardItem();
item->setEditable(false);
item->setData(QString("%1").arg(id++, 5, 10, QChar('0')), LogListItemDelegate::DT_Id);
item->setData(msg["icon"], LogListItemDelegate::DT_ICON);
item->setData(QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss"), LogListItemDelegate::DT_Timestamp);
item->setData(msg["title"], LogListItemDelegate::DT_Title);
item->setData(msg["subtitle"], LogListItemDelegate::DT_Subtitle);
item->setData(msg["details"], LogListItemDelegate::DT_Details);
item->setData(false, LogListItemDelegate::DT_Expanded);
// here I am unable to calculate the height, because the details does not have a specific height to set here,
// so when append the item to the list it is unvisible. If set the height 64, it is the exact height of the item without details, which is good
//item->setSizeHint(QSize(0, 64));
static_cast<QStandardItemModel *>(model())->appendRow(item);
scrollToBottom();
}
It is the code in sizeHint()
QSize LogListItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
bool expanded = index.data(DT_Expanded).toBool();
QFont fntDetials = option.font;
fntDetials.setPointSize(12);
QRect r = option.rect;
QFontMetrics fm(fntDetials);
QString details = index.data(DT_Details).toString();
QRect br = fm.boundingRect(r, Qt::TextWordWrap, details);
return QSize(option.rect.width(), br.height()+64);
}
Unfortunately not working..., I think Qt can look the Android ListView and its recycle functionality to solve the ListView problem, in this way, I think it is very very painful.
c++ qt qt5 qlistview qstandarditem
edited Dec 9 '18 at 6:10
eyllanesc
76.9k103156
asked Nov 20 '18 at 16:23
Bahramdun AdilBahramdun Adil
3,28641845
|
show 1 more comment
-2
I have created an expandable ListView which extends from the QListView, everything works well when I just want to show the Header data (Item which is not expanded) because I gave it a hard-coded height which is 64, the details appear when expanding the item. But the problem is I do not know the exact height of the details because the details can one line or more, I want to fit the Item height according to the item content.
Here the code which is handling click listener when the item expanding or collapsing:
LogListItemDelegate *delegate = static_cast<LogListItemDelegate *>(itemDelegate());
QStandardItem *item = static_cast<QStandardItemModel *>(model())->itemFromIndex(index);
bool expand = delegate->isExpandable() && mapFromGlobal(QCursor::pos()).x() >= visualRect(index).width() - 48;
bool expanded = index.data(LogListItemDelegate::DT_Expanded).toBool();
// here the height returned is header height, no containing the details which it is in expanding mode
int height = item->sizeHint().height();
if (!expanded) {
item->setData(true, LogListItemDelegate::DT_Expanded);
item->setSizeHint(QSize(0, 150)); // 150 here must be dynamically calculated
} else {
item->setData(false, LogListItemDelegate::DT_Expanded);
item->setSizeHint(QSize(0, 64)); // 64 is the header height, no prolem
}
Now the question is: How to calculate the height when item expanded?
Result:
Edit:
It is when I want to add the message to the list
void LogListView::addMessage(const QJsonObject &msg, const bool append)
{
static int id = 1; // unique id for log items
auto *item = new QStandardItem();
item->setEditable(false);
item->setData(QString("%1").arg(id++, 5, 10, QChar('0')), LogListItemDelegate::DT_Id);
item->setData(msg["icon"], LogListItemDelegate::DT_ICON);
item->setData(QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss"), LogListItemDelegate::DT_Timestamp);
item->setData(msg["title"], LogListItemDelegate::DT_Title);
item->setData(msg["subtitle"], LogListItemDelegate::DT_Subtitle);
item->setData(msg["details"], LogListItemDelegate::DT_Details);
item->setData(false, LogListItemDelegate::DT_Expanded);
// here I am unable to calculate the height, because the details does not have a specific height to set here,
// so when append the item to the list it is unvisible. If set the height 64, it is the exact height of the item without details, which is good
//item->setSizeHint(QSize(0, 64));
static_cast<QStandardItemModel *>(model())->appendRow(item);
scrollToBottom();
}
It is the code in sizeHint()
QSize LogListItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
bool expanded = index.data(DT_Expanded).toBool();
QFont fntDetials = option.font;
fntDetials.setPointSize(12);
QRect r = option.rect;
QFontMetrics fm(fntDetials);
QString details = index.data(DT_Details).toString();
QRect br = fm.boundingRect(r, Qt::TextWordWrap, details);
return QSize(option.rect.width(), br.height()+64);
}
Unfortunately not working..., I think Qt can look the Android ListView and its recycle functionality to solve the ListView problem, in this way, I think it is very very painful.
c++ qt qt5 qlistview qstandarditem
edited Dec 9 '18 at 6:10
eyllanesc
76.9k103156
asked Nov 20 '18 at 16:23
Bahramdun AdilBahramdun Adil
3,28641845
1
QStandardItem is not a visual element but an element that keeps data. The geometrical task depends on the delegate that has the sizeHint method, so the problem is in the delegate. To give you a solution, it shows the code of the delegate
– eyllanesc
Nov 20 '18 at 16:38
@eyllanesc First of all thanks for the replying! I did not find anything in Delegate which passes the correct height and width to the ListView. Can you show me how I can pas the height of the details to the ListView, I can calculate the height of the details, but there is no way to the set the height to retrieve it back in the when item clicked?
– Bahramdun Adil
Nov 20 '18 at 16:43
@BahramdunAdil, I thought you don't like the solution. The answer stays unaccepted, yet you are using my code. This does not seem like a fair play. I have created an expandable ListView sounds like the holy truth.
– scopchanov
Nov 21 '18 at 1:55
@scopchanov The problem still remains unsolved, so when the function completely implemented, then I will come back, thanks and accept the answers which were really solved the problem. By the way, your answer has been got the vote up. And also your solution was not expandable item view. And also I did not use your code even one line. Because your solution is not something I want. Thanks!!
– Bahramdun Adil
Nov 21 '18 at 2:30
@BahramdunAdil, which problem remains unsolved? You aksed a question and got an answer with a working example. Then you have complained that it is too complicated for you. Though, you used my solution and did not even mention (in your current question) where did you get it from. With such an attiude you won't get too much help around. But the best part is, that I know how to make the height of the expanded item fit the text, because I have written the code, and you don't.
– scopchanov
Nov 21 '18 at 2:42
|
show 1 more comment
-2
-2
-2
I have created an expandable ListView which extends from the QListView, everything works well when I just want to show the Header data (Item which is not expanded) because I gave it a hard-coded height which is 64, the details appear when expanding the item. But the problem is I do not know the exact height of the details because the details can one line or more, I want to fit the Item height according to the item content.
Here the code which is handling click listener when the item expanding or collapsing:
LogListItemDelegate *delegate = static_cast<LogListItemDelegate *>(itemDelegate());
QStandardItem *item = static_cast<QStandardItemModel *>(model())->itemFromIndex(index);
bool expand = delegate->isExpandable() && mapFromGlobal(QCursor::pos()).x() >= visualRect(index).width() - 48;
bool expanded = index.data(LogListItemDelegate::DT_Expanded).toBool();
// here the height returned is header height, no containing the details which it is in expanding mode
int height = item->sizeHint().height();
if (!expanded) {
item->setData(true, LogListItemDelegate::DT_Expanded);
item->setSizeHint(QSize(0, 150)); // 150 here must be dynamically calculated
} else {
item->setData(false, LogListItemDelegate::DT_Expanded);
item->setSizeHint(QSize(0, 64)); // 64 is the header height, no prolem
}
Now the question is: How to calculate the height when item expanded?
Result:
Edit:
It is when I want to add the message to the list
void LogListView::addMessage(const QJsonObject &msg, const bool append)
{
static int id = 1; // unique id for log items
auto *item = new QStandardItem();
item->setEditable(false);
item->setData(QString("%1").arg(id++, 5, 10, QChar('0')), LogListItemDelegate::DT_Id);
item->setData(msg["icon"], LogListItemDelegate::DT_ICON);
item->setData(QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss"), LogListItemDelegate::DT_Timestamp);
item->setData(msg["title"], LogListItemDelegate::DT_Title);
item->setData(msg["subtitle"], LogListItemDelegate::DT_Subtitle);
item->setData(msg["details"], LogListItemDelegate::DT_Details);
item->setData(false, LogListItemDelegate::DT_Expanded);
// here I am unable to calculate the height, because the details does not have a specific height to set here,
// so when append the item to the list it is unvisible. If set the height 64, it is the exact height of the item without details, which is good
//item->setSizeHint(QSize(0, 64));
static_cast<QStandardItemModel *>(model())->appendRow(item);
scrollToBottom();
}
It is the code in sizeHint()
QSize LogListItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
bool expanded = index.data(DT_Expanded).toBool();
QFont fntDetials = option.font;
fntDetials.setPointSize(12);
QRect r = option.rect;
QFontMetrics fm(fntDetials);
QString details = index.data(DT_Details).toString();
QRect br = fm.boundingRect(r, Qt::TextWordWrap, details);
return QSize(option.rect.width(), br.height()+64);
}
Unfortunately not working..., I think Qt can look the Android ListView and its recycle functionality to solve the ListView problem, in this way, I think it is very very painful.
c++ qt qt5 qlistview qstandarditem
edited Dec 9 '18 at 6:10
eyllanesc
76.9k103156
asked Nov 20 '18 at 16:23
Bahramdun AdilBahramdun Adil
3,28641845
I have created an expandable ListView which extends from the QListView, everything works well when I just want to show the Header data (Item which is not expanded) because I gave it a hard-coded height which is 64, the details appear when expanding the item. But the problem is I do not know the exact height of the details because the details can one line or more, I want to fit the Item height according to the item content.
Here the code which is handling click listener when the item expanding or collapsing:
LogListItemDelegate *delegate = static_cast<LogListItemDelegate *>(itemDelegate());
QStandardItem *item = static_cast<QStandardItemModel *>(model())->itemFromIndex(index);
bool expand = delegate->isExpandable() && mapFromGlobal(QCursor::pos()).x() >= visualRect(index).width() - 48;
bool expanded = index.data(LogListItemDelegate::DT_Expanded).toBool();
// here the height returned is header height, no containing the details which it is in expanding mode
int height = item->sizeHint().height();
if (!expanded) {
item->setData(true, LogListItemDelegate::DT_Expanded);
item->setSizeHint(QSize(0, 150)); // 150 here must be dynamically calculated
} else {
item->setData(false, LogListItemDelegate::DT_Expanded);
item->setSizeHint(QSize(0, 64)); // 64 is the header height, no prolem
}
Now the question is: How to calculate the height when item expanded?
Result:
Edit:
It is when I want to add the message to the list
void LogListView::addMessage(const QJsonObject &msg, const bool append)
{
static int id = 1; // unique id for log items
auto *item = new QStandardItem();
item->setEditable(false);
item->setData(QString("%1").arg(id++, 5, 10, QChar('0')), LogListItemDelegate::DT_Id);
item->setData(msg["icon"], LogListItemDelegate::DT_ICON);
item->setData(QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss"), LogListItemDelegate::DT_Timestamp);
item->setData(msg["title"], LogListItemDelegate::DT_Title);
item->setData(msg["subtitle"], LogListItemDelegate::DT_Subtitle);
item->setData(msg["details"], LogListItemDelegate::DT_Details);
item->setData(false, LogListItemDelegate::DT_Expanded);
// here I am unable to calculate the height, because the details does not have a specific height to set here,
// so when append the item to the list it is unvisible. If set the height 64, it is the exact height of the item without details, which is good
//item->setSizeHint(QSize(0, 64));
static_cast<QStandardItemModel *>(model())->appendRow(item);
scrollToBottom();
}
It is the code in sizeHint()
QSize LogListItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
bool expanded = index.data(DT_Expanded).toBool();
QFont fntDetials = option.font;
fntDetials.setPointSize(12);
QRect r = option.rect;
QFontMetrics fm(fntDetials);
QString details = index.data(DT_Details).toString();
QRect br = fm.boundingRect(r, Qt::TextWordWrap, details);
return QSize(option.rect.width(), br.height()+64);
}
Unfortunately not working..., I think Qt can look the Android ListView and its recycle functionality to solve the ListView problem, in this way, I think it is very very painful.
c++ qt qt5 qlistview qstandarditem
c++ qt qt5 qlistview qstandarditem
edited Dec 9 '18 at 6:10
eyllanesc
76.9k103156
asked Nov 20 '18 at 16:23
Bahramdun AdilBahramdun Adil
3,28641845
edited Dec 9 '18 at 6:10
eyllanesc
76.9k103156
asked Nov 20 '18 at 16:23
Bahramdun AdilBahramdun Adil
3,28641845
edited Dec 9 '18 at 6:10
eyllanesc
76.9k103156
edited Dec 9 '18 at 6:10
eyllanesc
76.9k103156
edited Dec 9 '18 at 6:10
eyllanesc
76.9k103156
76.9k103156
asked Nov 20 '18 at 16:23
Bahramdun AdilBahramdun Adil
3,28641845
asked Nov 20 '18 at 16:23
Bahramdun AdilBahramdun Adil
3,28641845
asked Nov 20 '18 at 16:23
Bahramdun AdilBahramdun Adil
3,28641845
3,28641845
1
QStandardItem is not a visual element but an element that keeps data. The geometrical task depends on the delegate that has the sizeHint method, so the problem is in the delegate. To give you a solution, it shows the code of the delegate
– eyllanesc
Nov 20 '18 at 16:38
@eyllanesc First of all thanks for the replying! I did not find anything in Delegate which passes the correct height and width to the ListView. Can you show me how I can pas the height of the details to the ListView, I can calculate the height of the details, but there is no way to the set the height to retrieve it back in the when item clicked?
– Bahramdun Adil
Nov 20 '18 at 16:43
@BahramdunAdil, I thought you don't like the solution. The answer stays unaccepted, yet you are using my code. This does not seem like a fair play. I have created an expandable ListView sounds like the holy truth.
– scopchanov
Nov 21 '18 at 1:55
@scopchanov The problem still remains unsolved, so when the function completely implemented, then I will come back, thanks and accept the answers which were really solved the problem. By the way, your answer has been got the vote up. And also your solution was not expandable item view. And also I did not use your code even one line. Because your solution is not something I want. Thanks!!
– Bahramdun Adil
Nov 21 '18 at 2:30
@BahramdunAdil, which problem remains unsolved? You aksed a question and got an answer with a working example. Then you have complained that it is too complicated for you. Though, you used my solution and did not even mention (in your current question) where did you get it from. With such an attiude you won't get too much help around. But the best part is, that I know how to make the height of the expanded item fit the text, because I have written the code, and you don't.
– scopchanov
Nov 21 '18 at 2:42
|
show 1 more comment
1
QStandardItem is not a visual element but an element that keeps data. The geometrical task depends on the delegate that has the sizeHint method, so the problem is in the delegate. To give you a solution, it shows the code of the delegate
– eyllanesc
Nov 20 '18 at 16:38
@eyllanesc First of all thanks for the replying! I did not find anything in Delegate which passes the correct height and width to the ListView. Can you show me how I can pas the height of the details to the ListView, I can calculate the height of the details, but there is no way to the set the height to retrieve it back in the when item clicked?
– Bahramdun Adil
Nov 20 '18 at 16:43
@BahramdunAdil, I thought you don't like the solution. The answer stays unaccepted, yet you are using my code. This does not seem like a fair play. I have created an expandable ListView sounds like the holy truth.
– scopchanov
Nov 21 '18 at 1:55
@scopchanov The problem still remains unsolved, so when the function completely implemented, then I will come back, thanks and accept the answers which were really solved the problem. By the way, your answer has been got the vote up. And also your solution was not expandable item view. And also I did not use your code even one line. Because your solution is not something I want. Thanks!!
– Bahramdun Adil
Nov 21 '18 at 2:30
@BahramdunAdil, which problem remains unsolved? You aksed a question and got an answer with a working example. Then you have complained that it is too complicated for you. Though, you used my solution and did not even mention (in your current question) where did you get it from. With such an attiude you won't get too much help around. But the best part is, that I know how to make the height of the expanded item fit the text, because I have written the code, and you don't.
– scopchanov
Nov 21 '18 at 2:42
1
1
QStandardItem is not a visual element but an element that keeps data. The geometrical task depends on the delegate that has the sizeHint method, so the problem is in the delegate. To give you a solution, it shows the code of the delegate
– eyllanesc
Nov 20 '18 at 16:38
QStandardItem is not a visual element but an element that keeps data. The geometrical task depends on the delegate that has the sizeHint method, so the problem is in the delegate. To give you a solution, it shows the code of the delegate
– eyllanesc
Nov 20 '18 at 16:38
@eyllanesc First of all thanks for the replying! I did not find anything in Delegate which passes the correct height and width to the ListView. Can you show me how I can pas the height of the details to the ListView, I can calculate the height of the details, but there is no way to the set the height to retrieve it back in the when item clicked?
– Bahramdun Adil
Nov 20 '18 at 16:43
@eyllanesc First of all thanks for the replying! I did not find anything in Delegate which passes the correct height and width to the ListView. Can you show me how I can pas the height of the details to the ListView, I can calculate the height of the details, but there is no way to the set the height to retrieve it back in the when item clicked?
– Bahramdun Adil
Nov 20 '18 at 16:43
@BahramdunAdil, I thought you don't like the solution. The answer stays unaccepted, yet you are using my code. This does not seem like a fair play. I have created an expandable ListView sounds like the holy truth.
– scopchanov
Nov 21 '18 at 1:55
@BahramdunAdil, I thought you don't like the solution. The answer stays unaccepted, yet you are using my code. This does not seem like a fair play. I have created an expandable ListView sounds like the holy truth.
– scopchanov
Nov 21 '18 at 1:55
@scopchanov The problem still remains unsolved, so when the function completely implemented, then I will come back, thanks and accept the answers which were really solved the problem. By the way, your answer has been got the vote up. And also your solution was not expandable item view. And also I did not use your code even one line. Because your solution is not something I want. Thanks!!
– Bahramdun Adil
Nov 21 '18 at 2:30
@scopchanov The problem still remains unsolved, so when the function completely implemented, then I will come back, thanks and accept the answers which were really solved the problem. By the way, your answer has been got the vote up. And also your solution was not expandable item view. And also I did not use your code even one line. Because your solution is not something I want. Thanks!!
– Bahramdun Adil
Nov 21 '18 at 2:30
@BahramdunAdil, which problem remains unsolved? You aksed a question and got an answer with a working example. Then you have complained that it is too complicated for you. Though, you used my solution and did not even mention (in your current question) where did you get it from. With such an attiude you won't get too much help around. But the best part is, that I know how to make the height of the expanded item fit the text, because I have written the code, and you don't.
– scopchanov
Nov 21 '18 at 2:42
@BahramdunAdil, which problem remains unsolved? You aksed a question and got an answer with a working example. Then you have complained that it is too complicated for you. Though, you used my solution and did not even mention (in your current question) where did you get it from. With such an attiude you won't get too much help around. But the best part is, that I know how to make the height of the expanded item fit the text, because I have written the code, and you don't.
– scopchanov
Nov 21 '18 at 2:42
|
show 1 more comment
1 Answer
1
active
oldest
votes
2
If you want to set a custom size you should use the sizeHint method of QStyledItemDelegate, for example:
#include <QApplication>
#include <QStyledItemDelegate>
#include <QListView>
#include <QStandardItemModel>
class HeightDelegate: public QStyledItemDelegate
{
public:
using QStyledItemDelegate::QStyledItemDelegate;
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override{
QSize s = QStyledItemDelegate::sizeHint(option, index);
// some calculation
int h = (index.row()+1)*20;
s.setHeight(h);
return s;
}
};
int main(int argc, char *argv)
{
QApplication a(argc, argv);
QListView w;
QStandardItemModel model;
HeightDelegate delegate;
w.setItemDelegate(&delegate);
w.setModel(&model);
for(int i=0; i<8; i++){
QStandardItem *it = new QStandardItem(QString::number(i));
it->setBackground(QBrush(QColor(qrand()%255, qrand()%255, qrand()%255)));
model.appendRow(it);
}
w.show();
return a.exec();
}
answered Nov 20 '18 at 17:06
eyllanesceyllanesc
76.9k103156
Thanks for the reply, I have tried your solution, but the problem not solved completely. Now the in the sizeHint() when I gave right height, and after when I change the width (to small size) of the window, then I lose the expand icon, then when I change it to bigger width, and after to smaller, I also lose the Icons.
– Bahramdun Adil
Nov 21 '18 at 2:36
@BahramdunAdil if you realize your problem depends on your implementation, and I can only help you when you provide a Minimal, Complete, and Verifiable example.
– eyllanesc
Nov 21 '18 at 2:38
1
@BahramdunAdil A Minimal, Complete, and Verifiable example does not refer to the code of your project but if your code is extensive then you create another project focused on the functionality, for example my code is a possible start, my code only focuses on the functionality.
– eyllanesc
Nov 21 '18 at 2:49
1
@scopchanov That is the decision of the OP, I will not judge your action because here the OP is not judged (unless it violates the rules), besides the answer is not only for the OP, it is for the community :-)
– eyllanesc
Nov 21 '18 at 2:51
1
@BahramdunAdil I recommend you strive and provide an early Minimal, Complete, and Verifiable example, remember that a good question is as valuable as a good answer.
– eyllanesc
Nov 21 '18 at 2:53
|
show 4 more comments
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If you want to set a custom size you should use the sizeHint method of QStyledItemDelegate, for example:
#include <QApplication>
#include <QStyledItemDelegate>
#include <QListView>
#include <QStandardItemModel>
class HeightDelegate: public QStyledItemDelegate
{
public:
using QStyledItemDelegate::QStyledItemDelegate;
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override{
QSize s = QStyledItemDelegate::sizeHint(option, index);
// some calculation
int h = (index.row()+1)*20;
s.setHeight(h);
return s;
}
};
int main(int argc, char *argv)
{
QApplication a(argc, argv);
QListView w;
QStandardItemModel model;
HeightDelegate delegate;
w.setItemDelegate(&delegate);
w.setModel(&model);
for(int i=0; i<8; i++){
QStandardItem *it = new QStandardItem(QString::number(i));
it->setBackground(QBrush(QColor(qrand()%255, qrand()%255, qrand()%255)));
model.appendRow(it);
}
w.show();
return a.exec();
}
answered Nov 20 '18 at 17:06
eyllanesceyllanesc
76.9k103156
Thanks for the reply, I have tried your solution, but the problem not solved completely. Now the in the sizeHint() when I gave right height, and after when I change the width (to small size) of the window, then I lose the expand icon, then when I change it to bigger width, and after to smaller, I also lose the Icons.
– Bahramdun Adil
Nov 21 '18 at 2:36
@BahramdunAdil if you realize your problem depends on your implementation, and I can only help you when you provide a Minimal, Complete, and Verifiable example.
– eyllanesc
Nov 21 '18 at 2:38
1
@BahramdunAdil A Minimal, Complete, and Verifiable example does not refer to the code of your project but if your code is extensive then you create another project focused on the functionality, for example my code is a possible start, my code only focuses on the functionality.
– eyllanesc
Nov 21 '18 at 2:49
1
@scopchanov That is the decision of the OP, I will not judge your action because here the OP is not judged (unless it violates the rules), besides the answer is not only for the OP, it is for the community :-)
– eyllanesc
Nov 21 '18 at 2:51
1
@BahramdunAdil I recommend you strive and provide an early Minimal, Complete, and Verifiable example, remember that a good question is as valuable as a good answer.
– eyllanesc
Nov 21 '18 at 2:53
|
show 4 more comments
2
If you want to set a custom size you should use the sizeHint method of QStyledItemDelegate, for example:
#include <QApplication>
#include <QStyledItemDelegate>
#include <QListView>
#include <QStandardItemModel>
class HeightDelegate: public QStyledItemDelegate
{
public:
using QStyledItemDelegate::QStyledItemDelegate;
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override{
QSize s = QStyledItemDelegate::sizeHint(option, index);
// some calculation
int h = (index.row()+1)*20;
s.setHeight(h);
return s;
}
};
int main(int argc, char *argv)
{
QApplication a(argc, argv);
QListView w;
QStandardItemModel model;
HeightDelegate delegate;
w.setItemDelegate(&delegate);
w.setModel(&model);
for(int i=0; i<8; i++){
QStandardItem *it = new QStandardItem(QString::number(i));
it->setBackground(QBrush(QColor(qrand()%255, qrand()%255, qrand()%255)));
model.appendRow(it);
}
w.show();
return a.exec();
}
answered Nov 20 '18 at 17:06
eyllanesceyllanesc
76.9k103156
Thanks for the reply, I have tried your solution, but the problem not solved completely. Now the in the sizeHint() when I gave right height, and after when I change the width (to small size) of the window, then I lose the expand icon, then when I change it to bigger width, and after to smaller, I also lose the Icons.
– Bahramdun Adil
Nov 21 '18 at 2:36
@BahramdunAdil if you realize your problem depends on your implementation, and I can only help you when you provide a Minimal, Complete, and Verifiable example.
– eyllanesc
Nov 21 '18 at 2:38
1
@BahramdunAdil A Minimal, Complete, and Verifiable example does not refer to the code of your project but if your code is extensive then you create another project focused on the functionality, for example my code is a possible start, my code only focuses on the functionality.
– eyllanesc
Nov 21 '18 at 2:49
1
@scopchanov That is the decision of the OP, I will not judge your action because here the OP is not judged (unless it violates the rules), besides the answer is not only for the OP, it is for the community :-)
– eyllanesc
Nov 21 '18 at 2:51
1
@BahramdunAdil I recommend you strive and provide an early Minimal, Complete, and Verifiable example, remember that a good question is as valuable as a good answer.
– eyllanesc
Nov 21 '18 at 2:53
|
show 4 more comments
2
2
2
If you want to set a custom size you should use the sizeHint method of QStyledItemDelegate, for example:
#include <QApplication>
#include <QStyledItemDelegate>
#include <QListView>
#include <QStandardItemModel>
class HeightDelegate: public QStyledItemDelegate
{
public:
using QStyledItemDelegate::QStyledItemDelegate;
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override{
QSize s = QStyledItemDelegate::sizeHint(option, index);
// some calculation
int h = (index.row()+1)*20;
s.setHeight(h);
return s;
}
};
int main(int argc, char *argv)
{
QApplication a(argc, argv);
QListView w;
QStandardItemModel model;
HeightDelegate delegate;
w.setItemDelegate(&delegate);
w.setModel(&model);
for(int i=0; i<8; i++){
QStandardItem *it = new QStandardItem(QString::number(i));
it->setBackground(QBrush(QColor(qrand()%255, qrand()%255, qrand()%255)));
model.appendRow(it);
}
w.show();
return a.exec();
}
answered Nov 20 '18 at 17:06
eyllanesceyllanesc
76.9k103156
If you want to set a custom size you should use the sizeHint method of QStyledItemDelegate, for example:
#include <QApplication>
#include <QStyledItemDelegate>
#include <QListView>
#include <QStandardItemModel>
class HeightDelegate: public QStyledItemDelegate
{
public:
using QStyledItemDelegate::QStyledItemDelegate;
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override{
QSize s = QStyledItemDelegate::sizeHint(option, index);
// some calculation
int h = (index.row()+1)*20;
s.setHeight(h);
return s;
}
};
int main(int argc, char *argv)
{
QApplication a(argc, argv);
QListView w;
QStandardItemModel model;
HeightDelegate delegate;
w.setItemDelegate(&delegate);
w.setModel(&model);
for(int i=0; i<8; i++){
QStandardItem *it = new QStandardItem(QString::number(i));
it->setBackground(QBrush(QColor(qrand()%255, qrand()%255, qrand()%255)));
model.appendRow(it);
}
w.show();
return a.exec();
}
answered Nov 20 '18 at 17:06
eyllanesceyllanesc
76.9k103156
answered Nov 20 '18 at 17:06
eyllanesceyllanesc
76.9k103156
answered Nov 20 '18 at 17:06
eyllanesceyllanesc
76.9k103156
answered Nov 20 '18 at 17:06
eyllanesceyllanesc
76.9k103156
76.9k103156
Thanks for the reply, I have tried your solution, but the problem not solved completely. Now the in the sizeHint() when I gave right height, and after when I change the width (to small size) of the window, then I lose the expand icon, then when I change it to bigger width, and after to smaller, I also lose the Icons.
– Bahramdun Adil
Nov 21 '18 at 2:36
@BahramdunAdil if you realize your problem depends on your implementation, and I can only help you when you provide a Minimal, Complete, and Verifiable example.
– eyllanesc
Nov 21 '18 at 2:38
1
@BahramdunAdil A Minimal, Complete, and Verifiable example does not refer to the code of your project but if your code is extensive then you create another project focused on the functionality, for example my code is a possible start, my code only focuses on the functionality.
– eyllanesc
Nov 21 '18 at 2:49
1
@scopchanov That is the decision of the OP, I will not judge your action because here the OP is not judged (unless it violates the rules), besides the answer is not only for the OP, it is for the community :-)
– eyllanesc
Nov 21 '18 at 2:51
1
@BahramdunAdil I recommend you strive and provide an early Minimal, Complete, and Verifiable example, remember that a good question is as valuable as a good answer.
– eyllanesc
Nov 21 '18 at 2:53
|
show 4 more comments
Thanks for the reply, I have tried your solution, but the problem not solved completely. Now the in the sizeHint() when I gave right height, and after when I change the width (to small size) of the window, then I lose the expand icon, then when I change it to bigger width, and after to smaller, I also lose the Icons.
– Bahramdun Adil
Nov 21 '18 at 2:36
@BahramdunAdil if you realize your problem depends on your implementation, and I can only help you when you provide a Minimal, Complete, and Verifiable example.
– eyllanesc
Nov 21 '18 at 2:38
1
@BahramdunAdil A Minimal, Complete, and Verifiable example does not refer to the code of your project but if your code is extensive then you create another project focused on the functionality, for example my code is a possible start, my code only focuses on the functionality.
– eyllanesc
Nov 21 '18 at 2:49
1
@scopchanov That is the decision of the OP, I will not judge your action because here the OP is not judged (unless it violates the rules), besides the answer is not only for the OP, it is for the community :-)
– eyllanesc
Nov 21 '18 at 2:51
1
@BahramdunAdil I recommend you strive and provide an early Minimal, Complete, and Verifiable example, remember that a good question is as valuable as a good answer.
– eyllanesc
Nov 21 '18 at 2:53
Thanks for the reply, I have tried your solution, but the problem not solved completely. Now the in the sizeHint() when I gave right height, and after when I change the width (to small size) of the window, then I lose the expand icon, then when I change it to bigger width, and after to smaller, I also lose the Icons.
– Bahramdun Adil
Nov 21 '18 at 2:36
Thanks for the reply, I have tried your solution, but the problem not solved completely. Now the in the sizeHint() when I gave right height, and after when I change the width (to small size) of the window, then I lose the expand icon, then when I change it to bigger width, and after to smaller, I also lose the Icons.
– Bahramdun Adil
Nov 21 '18 at 2:36
@BahramdunAdil if you realize your problem depends on your implementation, and I can only help you when you provide a Minimal, Complete, and Verifiable example.
– eyllanesc
Nov 21 '18 at 2:38
@BahramdunAdil if you realize your problem depends on your implementation, and I can only help you when you provide a Minimal, Complete, and Verifiable example.
– eyllanesc
Nov 21 '18 at 2:38
1
1
@BahramdunAdil A Minimal, Complete, and Verifiable example does not refer to the code of your project but if your code is extensive then you create another project focused on the functionality, for example my code is a possible start, my code only focuses on the functionality.
– eyllanesc
Nov 21 '18 at 2:49
@BahramdunAdil A Minimal, Complete, and Verifiable example does not refer to the code of your project but if your code is extensive then you create another project focused on the functionality, for example my code is a possible start, my code only focuses on the functionality.
– eyllanesc
Nov 21 '18 at 2:49
1
1
@scopchanov That is the decision of the OP, I will not judge your action because here the OP is not judged (unless it violates the rules), besides the answer is not only for the OP, it is for the community :-)
– eyllanesc
Nov 21 '18 at 2:51
@scopchanov That is the decision of the OP, I will not judge your action because here the OP is not judged (unless it violates the rules), besides the answer is not only for the OP, it is for the community :-)
– eyllanesc
Nov 21 '18 at 2:51
1
1
@BahramdunAdil I recommend you strive and provide an early Minimal, Complete, and Verifiable example, remember that a good question is as valuable as a good answer.
– eyllanesc
Nov 21 '18 at 2:53
@BahramdunAdil I recommend you strive and provide an early Minimal, Complete, and Verifiable example, remember that a good question is as valuable as a good answer.
– eyllanesc
Nov 21 '18 at 2:53
|
show 4 more comments
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QStandardItem is not a visual element but an element that keeps data. The geometrical task depends on the delegate that has the sizeHint method, so the problem is in the delegate. To give you a solution, it shows the code of the delegate
– eyllanesc
Nov 20 '18 at 16:38
@eyllanesc First of all thanks for the replying! I did not find anything in Delegate which passes the correct height and width to the ListView. Can you show me how I can pas the height of the details to the ListView, I can calculate the height of the details, but there is no way to the set the height to retrieve it back in the when item clicked?
– Bahramdun Adil
Nov 20 '18 at 16:43
@BahramdunAdil, I thought you don't like the solution. The answer stays unaccepted, yet you are using my code. This does not seem like a fair play. I have created an expandable ListView sounds like the holy truth.
– scopchanov
Nov 21 '18 at 1:55
@scopchanov The problem still remains unsolved, so when the function completely implemented, then I will come back, thanks and accept the answers which were really solved the problem. By the way, your answer has been got the vote up. And also your solution was not expandable item view. And also I did not use your code even one line. Because your solution is not something I want. Thanks!!
– Bahramdun Adil
Nov 21 '18 at 2:30
@BahramdunAdil, which problem remains unsolved? You aksed a question and got an answer with a working example. Then you have complained that it is too complicated for you. Though, you used my solution and did not even mention (in your current question) where did you get it from. With such an attiude you won't get too much help around. But the best part is, that I know how to make the height of the expanded item fit the text, because I have written the code, and you don't.
– scopchanov
Nov 21 '18 at 2:42