Qt designer size hint. Over 90 percent of questions asked here gets answered.

Qt designer size hint I use Python/PyQt, and have to create all my widgets in code. If you want to adjust that you could try setting each row's stretch factor. 8. The problem is that the definition of Expanding is not quite strong 文章浏览阅读7. M. The layou You don't need custom classes for such a trivial thing. Qt Widgets Designer is useful to use when experimenting with the design of a form since it avoids the compile, link and run cycle usually involved in user interface development. setSizeAdjustPolicy( QtWidgets. 1 - sizeHint:大小提示 sizeHint属性保存了部件的建议大小，对于不同的部件，默认拥有不同的sizeHint;同一部件的sizeHint也有可能不同，大小随着部件内容的变化而变化。 - minimumSizeHint:最小大小提示 minimumSizeHint保存了一个建议的最小大小提示，一般在布局中起作用。 - sizePolicy:大小策略 sizePolicy保存了部件的默认布局行为，在水平和垂直两个方 The widget can grow beyond its size hint if necessary. Could someone explaine what the typ The . 공학자를 위한 PySide2 0. e. A size can also be manipulated directly by retrieving references to the width and height using the rwidth() and rheight() functions. 在Qt Designer中部件的Font属性中可以设置对应部件的字体属性，包括字体的. All three classes are fully supported by Qt Designer and can also be used in code. 注意：如果Qt Style Sheets与setFont（）在同一个部件上使用，则如果设置冲突，样式表将优先. sizeHintForColumn(0)) If you don't want to force minimum width, then subclass and provide this as the size hint instead. Call QWidget::updateGeometry() [From Qt Doc: QLayout will never resize a widget to a size smaller than the minimum size hint unless minimumSize() is set or the size policy is set to QSizePolicy::Ignore. The layou From qt documentation QSizePolicy::Minimum The sizeHint() is minimal, and sufficient. make sure it never becomes smaller than that. In particular, if you apply it to a top-level window, then the user will not be free to resize the window. 0. widget의 기본크기및 크기변경에 대한 동작이 이 설정에 의해 정해진다. Each widget returns a QSizePolicy that describes the horizontal and vertical resizing policy it prefers when being laid out. The widget box provides a selection of standard Qt widgets, layouts, and other objects that can be used to create user interfaces on forms. See the following figure: The width of the QTableWidget should be adjusted so that it is not smaller than a reasonable minimum and not extend beyond the buttons above it; in particular, the size of the columns 1, 2, and 4 should be adjusted to their contents, How to properly size Qt widgets? is a vague question and depends on the use cases. QSizePolicy::ExpandFlag: 2: The widget should get as much space as possible. 5 기본 내장 위젯 - QLineEdit와 QComboBox 2. So you should reimplement these two virtual methods and return the size you want to force. 이걸 기록하는 이유도 난감했던 기억을 잊지 않기위해 하는 것이다. If you don't like that, you can instead perform the "set size to sizeHint" operation instantaneously each time it's needed, rather than imposing I need a QTableWidget based on a QTabelModel and QTableView with some buttons added above the table. I tried the stretch factor but it didn't work. Simply delete the unneeded widgets. Problem is that no matter how I try to resize the QTextEdit it seems it has a maximum height and cuts of text, even if I PySide6. That's why there are size policies, size hints, (In Qt terms, what I'm calling the "packed" size is simply the widget's sizeHint. So if your text is not long enough, it will probably use 80 as the width. 6 기본 내장 위젯 - hi , I am using qt 4. Layout managers consider this aspect, and try to optimize the available space by making the widgets use as much space as possible (assuming that they can be resized). 在 Qt Desiner 中拖一个 Spacer 出来，设置 Spacer 的 sizeHint 的宽度为 200，但是界面上的 Spacer 的宽度没有达到 200。可以看到这时它的 sizeType 属性设置的是 Expanding。 如果将它更改为 Fixed,这样界面上的 Spacer 马上变宽了，现在它的实际高度才是 sizeHint 的高度。 @Mattia Hi, I think I kind of find a solution. The size policy of a widget is an expression of its willingness to be resized in various ways, and What is the purpose of sizeHint() and minimumSizeHint() ? I see it often in widget class QSize LED ::sizeHint() const{return QSize(diamX_ , diamY_); Qt Widgets Designer's Widget Box. See also resizeRowsToContents(), sizeHintForRow(), and QHeaderView::resizeContentsPrecision(). [slot] void QTableView:: 在Qt Designer中，使用baseSize和sizeIncrement属性可以帮助我们更好地控制控件的大小和位置。当用户通过鼠标或键盘调整一个控件的大小时，它的大小会增加或减少sizeIncrement属性所指定的值。在这个程序中，我们创建了一个QLineEdit文本框，并且通过设置sizeIncrement属性将文本框的大小增量设为10x10。在这个程序中，我们创建了一 In general, QGridLayout will size rows and columns according to several factors including the widgets' size hints/policies etc. Commented Oct 1, If you are using the Qt designer, just click on the Detailed Description¶. The default size policy indicates that the size hint represents the preferred size of the widget, and this is often good enough for many widgets. Basically my main window contained a toolbar, menu bar, as well as status bar. While overcrowded UIs are usually not a good idea, having lots of empty space is rarely better. Most of the time choosing the good layouts and size-policy lets you achieve very adaptative GUI. Zero-size expanding Spacer, some way to top align in a group-box. This ensures that the content is displayed correctly and efficiently. statTable. There are several properties and methods with the keyword "hint" (for example a sizehint). Chapter 2 presented examples of both approaches. So, you should use a value that is greater than the minimal size of your children, for example the greatest number that can be represented with But if I place a layout between them in the main window it wants to have a fixed size. 4 기본 내장 위젯 - QLabel 2. 15 with C++17. Default layouts can handle 1/10 width. Any clue? This is my code, but is not How do I make a PyQt QLineEdit widget narrower than the default size of 17 x's when using QT Designer? Hot Network Questions Prove the following statement avoiding calculations as much as possible Pure function + Apply + ReplaceAll How to add a Line spacing to `chapter` and `section`, . QBoxLayout. sizeHint 属性保存了部件的建议大小，对于不同的部件，默认拥有不同的 sizeHint;同一部件的 sizeHint 也有可能不同，大小随着部件内容的变化而变化。 - minimumSizeHint:最小大小提示 I'm using Qt 5. QLayout will never resize a widget to a size smaller than the minimum size hint unless minimumSize() is set or the size policy is set to QSizePolicy::Ignore. If you need it to be shorter, I prefer using QToolButton instead, it doesn't have such minimum value. This function uses sizeHint() if it is valid, i. ui file (Ui::MyWidgetForm) has only 2 changes: its horizontal Size Policy changed to Maximum and an added QTabWidget: MyWidgetForm. The designer takes the current size and My problem would be solved if I knew how to do one of the three following things: Change a layout's default minimum size (s) for widgets. But note that their minimum width (or width hint) depends on their min/max value. Here’s the FindFileDialogcode using layout managers: FindFileDialog::FindFileDialog(QWidget *parent, Actually, QDoubleSpinBox and QSpinBox size policy is the same. 1 Qt Designer 소개 2. You can either change that property in Qt Designer, if you used it to build your UI, or via code: layout->setSizeConstraint(QLayout::SetMinimumSize); Here's the problem, by default QPushButton has a minimum size hint of about (80, 20) in all kinds of styles. Deleting a QWidget without telling anyone on the Hi all, I am facing a problem when i apply layouts in a widget. Scheduled Pinned Locked Moved General and Desktop 6 Posts 3 Posters 102. (Z(:^ 1 Reply Last reply . QWidget::setFixedSize worked but only with a pixel number, I think. Over 90 percent of questions asked here gets answered. sizePolicy 속성이다. 들어가기 전에 1. The thread How to set a precise size of QTableWidget to prevent from having scroll bars?(Qt-interest Archive, June 2007) between Lingfa Yang and Susan Macchia seems to resolve my question. The widget can be expanded, but there is no advantage to it being large Since there was no chance to determine the size of main window at very beginning, I have to change it later, at runtime. QGraphicsAnchor. ] layout 永远也不会把一个 widget 的大小设置到比 minimumSizeHint() 返回的尺寸还小，除非 widget 设置了最小尺寸或者其 The layout respects the sizeHint() and minimalSizeHint() of its children (not their size()). etc, themselves？ Why do we need the metric in GR? Why did the The size of the push button will be dictated by the layout it is placed in and the constraint imposed by that layout and the push button itself. What happens when you set the size policy to "MinimumExpanding"? Also, make sure the minimum size for that line edit is sufficiently small. In this example, the MyWidget class overrides the sizeHint function to return a fixed Each Qt widget has a recommended size, known as sizeHint (). I have added ui form to resource file . For example, setting stretch factors of two columns to 1 and 9 will resize 1st column to 1/10 of parent (assuming content of the 2nd column can grow Detailed Description¶. h unchanged, is: 1. You can change this for a specific widget by changing its sizePolicy property. The child widgets have a size policy and size hint that express preferences about the sizing of the Hi, I have a general question. 2 build on mingw on linux . The layout manager will attempt to resize a I prepared UI in Qt Designer and it looks now like that: Designer view: And here is my object inspector: That is, a value smaller than the minimal size hint of the respective widget will be replaced by the value of the hint. For example if a QMainWindow subclass has a central widget, with children and layout managers; then if widgets are hidden and variable size widgets like QTextEdit are visible it seems impossible to change the size of the window from code. Note: The size of top-level widgets are constrained to 2/3 of the desktop's height and width. Hot Network Questions How to recreate corrupt innodb tables with innodb_file_per_table? Why are some independent variables having huge std errors? Hide value in column when it is 0 Is Hebrews 10:26 mistranslated? Future-predicting machine Is crypto sniping illegal? Emergency measures to Adjusts the size of the widget to fit its contents. Since most push buttons will not expand vertically the height of the size hint should be a reasonable guide. This size, however, isn't the size I want to use for the minimum widgth. Unfortunately, the QComboBox is setting its size hint too large, to be big enough to contain its widest item. setClearButtonEnabled(true); #endif Moderators. What is the purpose of sizeHint () and I tried setting QSize size = QSize(40,40), and then casting "this" to ((QStandardItem*)this)->setSizeHint(size) in showEvent(QShowEvent *event), but that didn't QSize sizeHint() const override { return QSize(200, 100); // Recommended size: 200x100 . The default implementation of sizeHint() returns an invalid size if there is no layout for this widget, and returns the layout's preferred size otherwise. QAbstractScrollArea. A default QDoubleSpinBox width is very close to QSpinBox one, however, if you QDoubleSpinBox precision is 10 digits and it's max value is set to FLT_MAX, then it's width will become huge as Qt will set it so that the max Qt Development; General and Desktop [Solved] QTableWidget columns with different width [Solved] QTableWidget columns with different width. Whenever your size hint changes, you should call updateGeometry() on your own widget to trigger an update of the layout where the widget is placed in. Oldest to Newest Hi! In my case, every column will contain data with a very specific size. I have no doubt that there is probably a more terse way to express this. png This results in the right widget taking up all of the space, since the sizeHint of the left Widget is invalid or zero: MyQtApp1. name() Welcome to Qt Centre. The QGraphicsAnchorLayout class provides a layout where one can anchor widgets together in Graphics View. If minimumSize() is set, the minimum size hint will be ignored. If you really want the class name for Qt Linguist ( the translate function ) make sure the RTTI compiler option is on and use typeid(*this). QSizePolicy::ShrinkFlag: 4: The widget can shrink below its size hint if necessary. Qt Designer is useful to use when experimenting with the design of a form since it avoids the compile, link and run cycle usually involved in user interface development. Each Qt widget has a recommended size, known as sizeHint(). Call updateGeometry() The code generated for forms created using Qt Designer also uses the layout classes. Qt Centre is a community site devoted to programming in C++ using the Qt framework. I am having real trouble with a QTextEdit, trying to get it to have a minimal height but expanding. QSizePolicy. I have a dialog containing a QGridLayout with three columns. 3k次。本文探讨了Qt中部件（QWidget及其子类）的默认尺寸、sizeHint、setMaximumSize与布局管理的关系。默认部件大小通常是640*480，但布局会根据layout的首选大小调整部件尺寸。在布局中，部件的实际大小可能受到限制，因此必须明确设置部件的最小和最大尺寸，以避免因默认大小导致的布局过大问题。这对于优化Qt界面的显示至关 Qt Designer를 처음 접했을 때, Widget들을 어떻게 배치할지 난감했다. Most widgets also have a size hint. I'm developing a Qt Application and I'm trying to find a way to use QTextEdit as a label with long text without the scroll bar. In some cases, there is no need to have a different size. It's specified using the class QSizePolicy. I can't use Qt Creator to play with stuff, and I can't accept a Qt Creator solution. 3 기본 내장 위젯 - 버턴 2. Call QWidget::updateGeometry() Most Qt widgets have a size policy. If the value of this property is an invalid size, no size is recommended. I've tried changing changing the size policy. Lines up child widgets horizontally or vertically. sizeHintForColumn() will give you the max size over all items, so you can resize the widget like this: list. You should use QGridLayout::setColumnStretch function. GUIs created with Qt Widgets Designer can be compiled into an application or created at run-time. When two widgets are adjacent to each other in a horizontal layout, setting the horizontal stretch factor of the widget on the left to 2 and the 在PyQt中使用Qt Designer创建GUI界面时，我们可以设置部件（widget）的最小尺寸（minimumSize）和最大尺寸（maximumSize）。综上所述，通过使用minimumSize和maximumSize属性，我们可以在PyQt的Qt Designer中对部件的尺寸进行限制，确保其在运行时不会过小或过大。 The minimum size and size hints for the widget are based on the sizes of the labels, and eventually expanded, depending on the requested purpose: since you were using a layout, I considered the default layout margins and spacings of the current style (so that it will look like a "real" Qt layout), then I added the minimum size you set for the Qt Designer provides a scratch pad feature that allows you to collect frequently used objects in a separate category. The widget will get as much space as possible. For windows, the screen size is also taken into account. In my ui I have a QScrollArea and inside of it I want to place a couple off QTextEdit widgets and I only want use scrolling inside QScrollArea. I have the same or similar issues. S : this very looks like double-thread to me (except for the smiley) Current Qt projects : QCodeEdit, RotiDeCode. That said, there are obviously lots of situations for which a big window with lots of space is fine (for The maximum width and height of the QLabel is 16777215, the vertical size policy is set to Expanding and the horizontal is Preferred. , the size hint’s width and height are >= 0. Designer: Spacer doesn't do what I want By jochen_r in forum Qt Tools Replies: . The following examples illustrate how to create and use Qt Widgets Designer forms and how to create Qt Widgets Designer custom widget plugins. I will post more details shortly, if my testing works. But without knowing your precise requirements it's difficult to say more than that. Not only is this size too large horizontally to fit between the two dockers in the window's default size, but also when I resize the window at runtime the size of this layout remains the same while the dockers are nicely resizing. g. If you have widgets inside of a layout, the layout is in charge of the sizes. See documentation: The code generated for forms created using Qt Designer also uses the layout classes. The size policy of a widget is an expression of its willingness to be resized in various ways, and affects how the widget is treated by the layout engine. ; Resizes Widget The widget's size is then adjusted to match the calculated preferred size. setHorizontalStretch (stretchFactor) # Parameters:. size에 대해 minimum과 maximum값들도 존재하지만, 주의할 점은 이 size 관련 properties들이 sizeHint와 직접적 All you need to do is set the size adjust policy on the table when initialising the UI, and it will automatically resize to fit the contents. The widget allows the user to choose among the available window flags, and displays the effect on a separate preview window. AdjustToContents) You The risk can be avoided by taking account of the child widgets’ size hints,but that would complicate the code even further. 6k Views. I still need to trigger window->adjustSize() to make the window catch up with the table size (or more precisely, with the size of its ScrollArea). Using the properties portion of QtCreator/Designer, I used: This should help clue you in on how to better limit the size of the table. ) But a constraint may be too strong a solution in some instances. children() = . This size is typically based on the widget's content and layout, but it can also be influenced by other factors such as the widget's style and the current screen resolution. The current solution, is to add code at runtime like: @ ui->textEdit->setMinimumWidth(50); The above diagram shows such a composite widget that was created using Qt Designer. (in cpp) Remove that setFixedWidth code. Can anyone give a clear explain of these 3 concept? What's the difference I would like to place several of these widgets in a vertical layout box and have the parts line up. wrote on last edited by #2. I'm new to Qt, so I wonder whether there is a way to set the size of a QMainWindow to (for example) 70% of the user's desktop. Qt Widget Resizing with adjustSize() 2025-03-16. ] 这个属性所保存的 QSize 类 Qt中的 Size Hints 幸运的是，使用Qt Designer排列小部件不需要布局类知识。相反，从上下文菜单中选择“水平布局” 、“在网格中布局”等选项之一。 Each Qt widget has a recommended size, known assizeHint(). 在Qt Designer中，可以通过属性编辑器直观地设置这些策略，而在代码中则可通过。 是每个 Qt widgets（包括QPushButton）的一个属性，它决定了当窗口大小改变或者父容器大小改变时， 控件 （如QPushButton）应该如何 调整 自身的大小。 This has not been satisfactorily answered. The calls to layout->removeWidget() are redundant. N Offline. Call Welcome to Qt Centre. but it is not allowing to do so. stretchFactor must be in the range [0,255]. Each Qt widget has a recommended size, known as The size policy of a widget is an expression of its willingness to be resized in various ways, and affects how the widget is treated by the layout engine. The designer takes the current size and uses it. Update #1: My test now generates the nice-looking window:. Call If I right click on the first QTextEdit widget and select "Size Constraints | Set Minimum Width", I'm not prompted to enter a value. E. Finally, the width and height can be swapped using 环境：Qt Creator5. PySide2. sizeHint [From Qt Doc: This property holds the recommended size for the widget. Many of the examples provided with Qt use this approach, Size Hints and Size Policies. Qt Widget Size Hint . stretchFactor – int. Replies: 1 Last Post: 20th May 2011, 17:36. wrote on last edited by #3 When I put Qt widgets in a QHBoxLayout layout using QT Designer, there seems to be a minimum width for QLineEdit widgets of 17 x's, at least if this is the current source code: The size hint of QLineEdit is computed considering various aspects, most of them using private functions that are not exposed to the API, and the "x" count is hardcoded, meaning that this [From Qt Doc: QLayout will never resize a widget to a size smaller than the minimum size hint unless minimumSize() is set or the size policy is set to QSizePolicy::Ignore. This size hint tells the system a widget's preferred size If I right click on the first QTextEdit widget and select "Size Constraints | Set Minimum Width", I'm not prompted to enter a value. This size policy tells the system how the widget should stretch or shrink. (in ui) Reset minimumSize of centralWidget to default (0 x 0) Simply increasing the SizeHint to some large has the unwanted side effect that the preferred size of the overall window then also becomes very large, so the "Adjust Size (Ctrl+J)" command makes the window unacceptably large. The layout manager will attempt to resize a widget to meet its size hint. Recommendation The sizeHint function returns a QSize object that represents the suggested width and height for the widget. Qt handles all memory allocation in QWidget hierarchies. Calculates Preferred Size It determines the ideal size for the widget based on its content, layout, and any size hints or policies that have been set. The closest thing to a "default" size is the sizeHint() the button returns. I have a hierarchy of Widgets like hinted in the title: MainWindow : QMainWindow ->centralWidget() = QScrollArea ->widget() = QWidget ->layout() = QVBoxLayout ->children() = with InnerWidget. ratio 要执行的纵横比（因子）。 size 首先，用户可能对Qt Designer不太熟悉，所以教程需要从安装和打开Qt Designer开始。然后，要介绍主界面，包括部件箱、对象查看器、属性编辑器等部分，这样用户能快速找到所需工具。 You must activate() the layout before for its sizeHint(), and subsequently the widget's sizeHint(), to be updated immediately after modifying the laid out widgets. png If, on the other hand, I create the UI manually and make a Layout for the left Welcome to Qt Centre. The complete test code for this, with Test. Reimplement QWidget::minimumSizeHint() to return the smallest size the widget can have. – G. The scratch pad category can be filled with any widget currently displayed in a form by dragging them from the form and dropping them onto the widget box. Ideally I would like to set the size hints so all the prefixes had the same hint, all When the widget is created the system uses sizeHint for how to big to make at start. I need to set it to AdjustToContents to get the behaviour I want. The code liked below, // first set child widget レイアウトの可視化 Qt Designer などのツールを使用して、レイアウトの構造とウィジェットのサイズを確認します。 デバッガを使用 レイアウトマネージャの挙動やウィジェットのサイズ計算をステップ実行して確認します。 Qt中的 Size Hints 和 Size Policies. The Qt Designer configuration block for the QTableWidget includes QAbstractScrollArea with property sizeAdjustPolicy. One of the rows contains a QComboBox, a QPushbutton, and another QPushButton in each column respectively. ] layout 永远也不会把一个 widget 的大小设置到比 minimumSizeHint() 返回的尺寸还小，除非 widget 设置了最小尺寸或者其 Thats because this is the size of the QListWidget, the viewport, not the items. But even with all these things in place, it seems the layout manager is still not guaranteed to honour the size-hint when the minimum-size-hint is less. 2 폼으로 작성하는 위젯 2. nurupo. 1. I want each column to be the same size and scale equally. QGraphicsAnchorLayout. Set QWidget to 100% size. (you may also want to set the size hint as fixed) P. . Composite widgets can also be created by subclassing a standard widget, such as QWidget or QFrame, and adding the necessary layout and child widgets in the constructor of the subclass. Force a layout not to alter widgets • The QSizePolicy class is a layout attribute describing horizontal and vertical resizing policy. then size of child widgets are changed automatically. 2025-03-16. 개념잡기 2. but now, I want to resize it again as same size as earlier to applying layout. Purpose of size hint is entirely different. A size is specified by a width() and a height(). It can be set in the constructor and changed using the setWidth(), setHeight(), or scale() functions, or using arithmetic operators. (in ui) Set horizontal size policy of scrollArea to "Fixed" as I mentioned. QSizePolicy::IgnoreFlag: 8: The widget's size hint is ignored. We declare a private updatePreview() slot to refresh the Resizes the given row based on the size hints of the delegate used to render each item in the row. 大小提示（size hint）和最小大小提示（minimum size hint） 如果需要绘制的窗口部件的尺寸（包括长和高两个方面）小于其最小提示（这在Qt Designer中往往表现为有些被压缩的看不到它的内容），并且该窗口部件的最小提示在最大尺寸和最小尺寸允许的范围内，那么该窗口部件显示的尺寸将是其最小提示的值。 The code generated for forms created using Qt Widgets Designer also uses the layout classes. Qt Designer can help to do this right, even if the layout management is not always intuitive (you need to place your widgets first and then set them in layouts from the inner to the outer layout). Sets the horizontal stretch factor of the size policy to the given stretchFactor. If you are looking for information about Qt related issue — register and post your question. For example, the height of a QLineEdit is Reimplement QWidget::sizeHint() to return the preferred size of the widget. 5. 文章浏览阅读345次。本文介绍了PyQt中Qt Designer的spacer部件及其sizeHint属性，该属性决定在布局中的大小。spacer部件用于创建空白空间，调整布局中的部件间距。通过修改sizeHint属性，可以定制spacer的尺寸，实现不同布局效果。 #if QT_VERSION >= 0x050200 edit. Qt Designer - Fixed size Found it. Represents an anchor between two items in a QGraphicsAnchorLayout. I get segmentation faul Current size of widget in QT. 1 - sizeHint:大小提示. 9k次，点赞3次，收藏11次。原文地址Qt 中的 sizeHint 属性，sizeHint()如何使用？Qt 中的 minimumSizeHint属性，minimumSizeHint() 如何使用？Qt 中的 sizePolicy属性，setSizePolicy()、sizePolicy()如何使用？ 之前一直对这几个属性搞不清楚，前几天仔仔细细地看了文档解释并做了一些测试，现在来归纳一下： _qsizepolicy::preferred, 这些类解决了自动布局小部件的挑战，提供行为可预测的用户界面。幸运的是，使用Qt Designer排列小部件不需要布局类知识。相反，从上下文菜单中选择“水平布局” 、“在网格中布局”等选项之一。 Each Qt widget has a recommended size, known assizeHint(). This can either be done via Qt Designer (in the QAbstractScrollArea section of the Property Editor), or programmatically, like this: self. 字体簇（Family） 大小（Size） 是否粗体（Bold） 是否斜体（Italic） 是否带下划线（Underline） Additionally to what @mrjj wrote, you should also be able to set the size of the view via a StyleSheet, a viable option if you don't plan to vary the size all to often ui->comboBox->setStyleSheet("QComboBox QAbstractItemView {min-width: 400px;}"), 文章浏览阅读2. 위젯 기초 2. setMinimumWidth(list. 环境： Qt Creator 5. : 学习Qt中设置部件大小的方法。 该内容介绍如何在Qt中为控件添加背景图片。主要方法包括：1) 在样式表中使用`border-image`属性指定控件及其背景图片；2) 使用调色板`QPalette`设置图片，但可能导致窗口显示不下；3) 在`paintEvent`中绘制图片，适合自定义绘图但不适用于子窗口；4) 通过覆盖一个大小与窗口相同的`QLabel`来设置背景图片，可实现动态背景。 Qt Designerのようにグラフィカルにウィジェットを編集するツールは、 レイアウトコードを使いこなせるようになってから使ってこそ効果的です。 レイアウトがどのようなことをしているかを本質的に掴めるようになるには、 コードで記述できることが必須です。 The ControllerWindow class inherits QWidget. I have problem loading ui file at run time . And sizeHint() is the recommended size of a QWidget, and the Layout of the widget parent will take sizeHint() and sizePolicy() into consideration to determine the space of the child widget can hold. QtWidgets. The simple solution is to set the minimum width explicitly: Qt Widgets Designer is a capable graphical user interface designer that lets you create and configure forms without writing code. Then when the first child widget (will be central widget of main window) was created, it's best chance for me to adjust the size. QButtonGroup. QSizePolicy contains two Qt Designer is useful to use when experimenting with the design of a form since it avoids the compile, link and run cycle usually involved in user interface development. Otherwise, it sets the size to the children rectangle that covers all child widgets (the union of all child widget rectangles). A size policy has both vertical and horizontal components. zwndq hkumk mnl frnzt nekdp dlaxhr lvgzpwu jfhnwl oyi yzrq ukausv vcqjsfw rgkv ugkrjn flqujg