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Qt: How to Access Inherited Widget?


Qt: How to Access Inherited Widget?

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Qt: How to Access Inherited Widget?
Tag : cpp , By : dantino
Date : January 12 2021, 09:11 PM

may help you . Your question could do with a example to make it more clear.
But, if what you are doing is something like
class MyWidget : public QPushButton {
class Base {
protected:
    int base_int;
};

class Derived : public Base {
    int derived_int;
public:
    int getBaseInt() const { return base_int; }
    int getDerivedInt() const { return derived_int; }
};
int getBaseInt() const { return Base::base_int; }

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Dojo1.9: Custom widget inherited from another custom widget template string update not reflected


Tag : development , By : Ray
Date : March 29 2020, 07:55 AM
To fix this issue data-dojo-attach-point (which you should use for 1.6+ instead of dojoAttachPoint) allows you to have handles for dom nodes in your template.. It is parsed by _TemplatedMixin's buildRendering(), so it will be available in your buildRendering method just after this.inherited line.
You can not set data-dojo-attach-point using setAttribute, it can only be defined in templates to be parsed by TemplatedMixin. If you need your child widget to add some markup in addition to what there is in its parent's template, you can define a variable in your parent's markup, and overwrite it in your child widget:
<div data-dojo-attach-point="widget">
    <div data-dojo-attach-point="title">${name}</div>
    <div data-dojo-attach-point="dnmschart"></div>
    ${childMarkup}
</div>
require([
    'dojo/_base/declare',
    'my/widget/view/AbstractWidget'
], function (declare, AbstractWidget) {
return declare("my.widget.view.AbstractChart", [AbstractWidget], {

    buildRendering: function(){
        this.childMarkup = '<div data-dojo-attach-point="gridPlaceHolder"></div>';
        this.inherited(arguments);
    }
});

How to access inherited of inherited Canvas of TImage?


Tag : delphi , By : jrf
Date : March 29 2020, 07:55 AM
wish of those help You can use a technique similar to what you already have, but access the Canvas property instead of the FCanvas field. The Canvas property is protected, which means it's technically part of the control's interface, so you shouldn't worry about it changing in a future version. (It might still change, but it's not something you should worry about.)
type
  THackGraphicControl = class(TGraphicControl) end;

LCanvas := THackGraphicControl(Self).Canvas;

How to set border to widget, inherited from QFrame?


Tag : cpp , By : Gerhard Miller
Date : March 29 2020, 07:55 AM
this one helps. You have to draw on top of the QFrame, the rectangle inside the edge you get through contentsRect(). The setFrameStyle(), setLineWidth(), and setLineWidth() methods do it in the constructor since you will call it only once.
ledindicator.h
#ifndef LEDINDICATOR_H
#define LEDINDICATOR_H

#include <QFrame>

class LedIndicator : public QFrame
{
    Q_OBJECT
    Q_PROPERTY(bool state READ state WRITE setState)
    Q_PROPERTY(QColor onColor READ onColor WRITE setOnColor)
    Q_PROPERTY(QColor offColor READ offColor WRITE setOffColor)
    Q_PROPERTY(Qt::BrushStyle onPattern READ onPattern WRITE setOnPattern)
    Q_PROPERTY(Qt::BrushStyle offPattern READ offPattern WRITE setOffPattern)
    Q_PROPERTY(int side READ side WRITE setSide)
public:
    LedIndicator(QWidget *parent = nullptr);
    bool state() const;
    void setState(bool state);

    QColor onColor() const;
    void setOnColor(const QColor &onColor);

    QColor offColor() const;
    void setOffColor(const QColor &offColor);

    Qt::BrushStyle onPattern() const;
    void setOnPattern(const Qt::BrushStyle &onPattern);

    Qt::BrushStyle offPattern() const;
    void setOffPattern(const Qt::BrushStyle &offPattern);
    int side() const;
    void setSide(int side);
public slots:
    void toggle();
protected:
    void paintEvent(QPaintEvent *event);
private:
    bool m_state;
    QColor m_onColor;
    QColor m_offColor;
    Qt::BrushStyle m_onPattern;
    Qt::BrushStyle m_offPattern;
    int m_side;
};

#endif // LEDINDICATOR_H
#include "ledindicator.h"

#include <QPainter>

LedIndicator::LedIndicator(QWidget *parent) :
    QFrame(parent),
    m_state(false),
    m_onColor(Qt::green),
    m_offColor(Qt::red),
    m_onPattern(Qt::SolidPattern),
    m_offPattern(Qt::SolidPattern)
{
    setFrameStyle( QFrame::Box | QFrame::Raised);
    setLineWidth(0);
    setMidLineWidth(3);
}

void LedIndicator::paintEvent(QPaintEvent *event) {
    QFrame::paintEvent(event);
    QPainter p(this);
    QBrush b = m_state ? QBrush(m_onColor, m_onPattern): QBrush(m_offColor, m_offPattern);
    p.fillRect(contentsRect(), b);
}

int LedIndicator::side() const
{
    return m_side;
}

void LedIndicator::setSide(int side)
{
    m_side = side;
    setFixedSize(side, side);
}

Qt::BrushStyle LedIndicator::offPattern() const
{
    return m_offPattern;
}

void LedIndicator::setOffPattern(const Qt::BrushStyle &offPattern)
{
    m_offPattern = offPattern;
}

void LedIndicator::toggle()
{
    setState(!state());
}

Qt::BrushStyle LedIndicator::onPattern() const
{
    return m_onPattern;
}

void LedIndicator::setOnPattern(const Qt::BrushStyle &onPattern)
{
    m_onPattern = onPattern;
}

QColor LedIndicator::offColor() const
{
    return m_offColor;
}

void LedIndicator::setOffColor(const QColor &offColor)
{
    m_offColor = offColor;
    update();
}

QColor LedIndicator::onColor() const
{
    return m_onColor;
}

void LedIndicator::setOnColor(const QColor &onColor)
{
    m_onColor = onColor;
    update();
}

bool LedIndicator::state() const
{
    return m_state;
}

void LedIndicator::setState(bool state)
{
    m_state = state;
    update();
}

BlocProvider not available within inherited widget


Tag : flutter , By : davidg
Date : March 29 2020, 07:55 AM
seems to work fine You should use your BlocProvider() above the MaterialApp widget.
Navigator is a widget added by MaterialApp and when you call it to change a route it replaces the widget in home: property and hence replaces your BlocProvider.
 Widget build(BuildContext context) {
  return BlocProvider(
    child: MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'E-Form',
      color: Color(0xFF44697D),
      home: LaunchScreen(),
    ),
  );
 }

How to dispose bloc when using Inherited Widget?


Tag : dart , By : Myatus
Date : March 29 2020, 07:55 AM
wish help you to fix your issue That is not possible using Inheritedwidget. The widget is not made to handle data, but to share it.
You have to wrap your Inheritedwidget into a StatefulWidget and use the dispose of the latter
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