轉自：https://blog.csdn.net/u013928315/article/details/78123573

一、QGridLayout屬性介紹

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1、QGridlayout以方格的形式管理窗口部件，先看QGridLayout的屬性，如下圖

2、各個參數的介紹

layoutLeftMargin ...至layoutBottomMargin在ui_MainWindow.h中自動生成的代碼是：

gridLayout->setContentsMargins(20, 10, 10, 10);

學過CSS都知道，這是設置一個元素所有外邊距的寬度，或者設置各邊上外邊距的寬度

On most platforms, the margin is 11 pixels in all directions.

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HorizontalSpacing...至VerticalSpacing在ui_MainWindow.h中自動生成的代碼是：

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? ? ? ? gridLayout->setHorizontalSpacing(6);

? ? ? ? gridLayout->setVerticalSpacing(6);

? ? ? ? 這是設置兩個控件之間的水平和豎直距離

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LayoutRowStretch在ui_MainWindow.h中自動生成的代碼是：

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gridLayout->setRowStretch(0, 1);

? ? ? ? gridLayout->setRowStretch(1, 1);

? ? ? ? gridLayout->setRowStretch(2, 1);

表示在第0行、第1行、第2行 在豎直方向的空間比例分配，大家稍微改一下參數就能看出來效果

LayoutColumnStretch在ui_MainWindow.h中自動生成的代碼是：? ? ??

gridLayout->setColumnStretch(1, 1);

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表示設置第0列、第1列兩者在水平方向的空間比例分配。

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LayoutRowMinimumHeight在ui_MainWindow.h中自動生成的代碼是：

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? ? ? ? gridLayout->setRowMinimumHeight(0, 1);

? ? ? ? gridLayout->setRowMinimumHeight(1, 2);

? ? ? ? gridLayout->setRowMinimumHeight(2, 3);

表示在第0行、第1行、第2行的最小高度是1pixels,2pixels,3pixels

LayoutColumnMinimumWidth在ui_MainWindow.h中自動生成的代碼是：

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? gridLayout->setColumnMinimumWidth(0, 4);

? ? ? ? gridLayout->setColumnMinimumWidth(1, 5);

表示設置第0列、第1列的最小寬度是4pixels、5pixels

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LayoutSizeConstraint在ui_MainWindow.h中自動生成的代碼是：

gridLayout->setSizeConstraint(QLayout::SetDefaultConstraint);

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This property holds the resize mode of the layout.看下表

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enum QLayout::SizeConstraint

The possible values are:

Constant Value Description

QLayout::SetDefaultConstraint	0	The main widget's minimum size is set to?minimumSize(), unless the widget already has a minimum size.
QLayout::SetFixedSize	3	The main widget's size is set to?sizeHint(); it cannot be resized at all.
QLayout::SetMinimumSize	2	The main widget's minimum size is set to?minimumSize(); it cannot be smaller.
QLayout::SetMaximumSize	4	The main widget's maximum size is set to?maximumSize(); it cannot be larger.
QLayout::SetMinAndMaxSize	5	The main widget's minimum size is set to?minimumSize() and its maximum size is set tomaximumSize().
QLayout::SetNoConstraint	1	The widget is not constrained. ? ?

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QFormLayout屬性介紹

1、QFormLayout類管理輸入型控件和它的label組成的那些form表格，包括它的界面參數如下圖

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2、界面中對應的代碼如下表，

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Cpp代碼???

formLayout?=?new?QFormLayout(widget1);??

????????formLayout->setSpacing(6);??

????????formLayout->setContentsMargins(11,?11,?11,?11);??

????????formLayout->setObjectName(QString::fromUtf8("formLayout"));??

????????formLayout->setFieldGrowthPolicy(QFormLayout::ExpandingFieldsGrow);??

????????formLayout->setRowWrapPolicy(QFormLayout::DontWrapRows);??

????????formLayout->setContentsMargins(0,?0,?0,?0);??

????????label_4?=?new?QLabel(widget1);??

????????label_4->setObjectName(QString::fromUtf8("label_4"));??

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????????formLayout->setWidget(0,?QFormLayout::LabelRole,?label_4);??

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????????lineEdit?=?new?QLineEdit(widget1);??

????????lineEdit->setObjectName(QString::fromUtf8("lineEdit"));??

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????????formLayout->setWidget(0,?QFormLayout::FieldRole,?lineEdit);??

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????????label_5?=?new?QLabel(widget1);??

????????label_5->setObjectName(QString::fromUtf8("label_5"));??

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????????formLayout->setWidget(1,?QFormLayout::LabelRole,?label_5);??

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????????comboBox?=?new?QComboBox(widget1);??

????????comboBox->setObjectName(QString::fromUtf8("comboBox"));??

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????????formLayout->setWidget(1,?QFormLayout::FieldRole,?comboBox);??

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3、其中值得一說的是：LayoutFieldGrowthPolicy屬性

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enum QFormLayout::FieldGrowthPolicy

This enum specifies the different policies that can be used to control the way in which the form's fields grow.

Constant Value Description

QFormLayout::FieldsStayAtSizeHint	0	The fields never grow beyond their?effective size hint. This is the default forQMacStyle.
QFormLayout::ExpandingFieldsGrow	1	Fields with an horizontal?size policy?of?Expanding?or?MinimumExpanding?will grow to fill the available space. The other fields will not grow beyond their effective size hint. This is the default policy for Plastique.
QFormLayout::AllNonFixedFieldsGrow	2	All fields with a size policy that allows them to grow will grow to fill the available space. This is the default policy for most styles.

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4、還有一個屬性值得說：LayoutRowWrapPolicy

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This property holds the way in which the form's rows wrap.

//這個屬性設置了表格如何排版各個元素

If you want to display each label above its associated field (instead of next to it), set this property to WrapAllRows.

//如果你想把每個標簽放在相關字段的上方，而不是和它相鄰，就設置這個屬性值為WrapAllRows。

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enum QFormLayout::RowWrapPolicy

This enum specifies the different policies that can be used to control the way in which the form's rows wrap.

Constant Value Description

QFormLayout::DontWrapRows	0	Fields are always laid out next to their label. This is the default policy for all styles except Qt Extended styles and?QS60Style.
QFormLayout::WrapLongRows	1	Labels are given enough horizontal space to fit the widest label, and the rest of the space is given to the fields. If the minimum size of a field pair is wider than the available space, the field is wrapped to the next line. This is the default policy for Qt Extended styles and andQS60Style.
QFormLayout::WrapAllRows	2	Fields are always laid out below their label.

總結

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