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滚动条控制Qt中滚动区域的滚动

发布于 2024-11-27 17:44:07 字数 833 浏览 0 评论 0原文

我是 QT 框架的新手，所以请耐心等待...

我被赋予了这个简单的任务，我有一系列 Qlabel，每个 Qlabel 都设置为 .png 图片，

这些多个 Qlabel 不适合屏幕，所以这里的滚动条会很方便......

所以我将所有项目插入滚动区域，

看看情况：在此处输入图像描述

我想要滚动条控制滚动区域上下滚动

我已经创建了插槽 slipMoved( ）当幻灯片移动时吸收滚动条生成的信号，

这是 Form.cpp 类：

//Form.cpp
#include "form1.h"
#include "form.h"
#include "ui_form.h"
#include "ui_form1.h"
#include<QScrollArea>
#include<QScrollBar>

Form::Form(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Form)
{
    ui->setupUi(this);


}

Form::~Form()
{
    delete ui;
}

void Form::slideMoved()
{

}

我的问题如下，

-我这样做对吗？或者他们是其他更简单的方法吗？

-slideMoved() 应该如何通过上下滚动滚动区域来处理事件

请具体说明，因为我是新手，我将不胜感激

谢谢

原文

I am new to QT framework , so please bear with me...

I have been given this simple task , i have a series of Qlabels each one is set to a .png pic

these Multiple Qlabels don't fit the screen , so a scroll bar here would be handy ...

so i inserted all of my items in my Scroll area

take a look at the situation :
enter image description here

i want the scroll bar to controll the Scroll area to scroll up and down

I Have created the slot slideMoved() that absorbs the signal generated by the scroll bar when the the slide is moved

this is the Form.cpp class :

//Form.cpp
#include "form1.h"
#include "form.h"
#include "ui_form.h"
#include "ui_form1.h"
#include<QScrollArea>
#include<QScrollBar>

Form::Form(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Form)
{
    ui->setupUi(this);


}

Form::~Form()
{
    delete ui;
}

void Form::slideMoved()
{

}

My Questions are the following,

-am i doing this right , or their is an other simpler way to do that ?

-how should slideMoved() handle the event by scrolling up and down the scroll area

Please be Specific since i am new to this, I would appreciate that

thank you

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谈下烟灰 2024-12-04 17:44:07

如果要创建插槽，则必须指定它是插槽。

这样做是这样的

private slots:
    void slideMoved();

然后你必须按照你的方式实现这个插槽。

void Form::slideMoved(int val)
{
    ...
}

最后，您必须将信号连接到您的插槽，以便在发出信号时触发您的插槽。

connect(sender,SIGNAL(sliderMoved(int)),receiver,SLOT(slideMoved(int)));

然后您可以创建一个新变量来保存之前的滑块值。
每次执行插槽时，您都会将前一个值与新值进行比较，以了解运动情况。

private:
    int previousValue;

插槽可以是这样的。

void Form::slideMoved(int val)
    {
        if(val<previousValue) qDebug() << "Previous value is smaller";
        else qDebug() << "Previous values is bigger";
        previousValue = val;
    }

您可以在此处阅读有关信号和槽的更多信息

If you want to create a slot you must specify that it is a slot.

This is done like this

private slots:
    void slideMoved();

Then you have to implement this slot in the way you did.

void Form::slideMoved(int val)
{
    ...
}

In the end you have to connect a signal to your slot in order to trigger your slot when the signal is being emmited.

connect(sender,SIGNAL(sliderMoved(int)),receiver,SLOT(slideMoved(int)));

Then you can create a new variable to hold the previous slider value.
Every time your slot will be executed you will compare the previous value with the new one in order to understand the movement.

private:
    int previousValue;

The slot can be something like this.

void Form::slideMoved(int val)
    {
        if(val<previousValue) qDebug() << "Previous value is smaller";
        else qDebug() << "Previous values is bigger";
        previousValue = val;
    }

You can read more about signals and slots here

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