PyQt 100% 宽度 window

Question

所以我正在尝试创建一个 window (QDialog)，宽度为 100%（屏幕的），高度为固定值，例如。 60px.

我试图通过将 maximumSize 的高度属性设置为 60px 来实现这一点，而宽度保持不变。 (16777215) 我还将水平方向的 sizePolicy 设置为 Maximum，垂直方向设置为 Fixed，拉伸值分别为 1 和 0。

如您在上图中所见，对话框居中显示，但根本没有水平拉伸。

代码很简单，如下所示，就是一个无框的QDialog:

from PyQt5 import QtWidgets, QtCore, uic
import sys
import os

class FMenu(QtWidgets.QDialog):
    def __init__(self):
        super(FMenu, self).__init__()
        os.chdir(os.path.dirname(__file__))
        self.ui = uic.loadUi('./ui/ui_searchbar.ui', self)
        self.ui.setWindowFlags(QtCore.Qt.FramelessWindowHint)
        self.ui.show()

app = QtWidgets.QApplication(sys.argv)
window = FMenu()
app.exec_()

我用QtDesigner创建的ui文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>SearchBar</class>
 <widget class="QDialog" name="SearchBar">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>60</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
    <horstretch>1</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="maximumSize">
   <size>
    <width>16777215</width>
    <height>60</height>
   </size>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <property name="styleSheet">
   <string notr="true">background: #2b2b2b;</string>
  </property>
  <widget class="QWidget" name="centralwidget" native="true">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>801</width>
     <height>61</height>
    </rect>
   </property>
   <widget class="QLineEdit" name="lineEdit_searchBar">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>10</y>
      <width>781</width>
      <height>41</height>
     </rect>
    </property>
    <property name="sizePolicy">
     <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
      <horstretch>1</horstretch>
      <verstretch>0</verstretch>
     </sizepolicy>
    </property>
    <property name="maximumSize">
     <size>
      <width>16777215</width>
      <height>41</height>
     </size>
    </property>
    <property name="font">
     <font>
      <family>Times New Roman</family>
      <pointsize>22</pointsize>
     </font>
    </property>
    <property name="styleSheet">
     <string notr="true">background: #3b3b3b;
color: #fff;</string>
    </property>
    <property name="placeholderText">
     <string>Write here...</string>
    </property>
   </widget>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>

我错过了什么？

Answer 1

maximumSize 仅表示它可以占用的最大尺寸，并不表示widget 会被拉伸。在那种情况下，最好使用布局：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>SearchBar</class>
 <widget class="QDialog" name="SearchBar">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>870</width>
    <height>60</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
    <horstretch>1</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="maximumSize">
   <size>
    <width>16777215</width>
    <height>60</height>
   </size>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <property name="styleSheet">
   <string notr="true">background: #2b2b2b;</string>
  </property>
  <layout class="QHBoxLayout" name="horizontalLayout">
   <item>
    <widget class="QWidget" name="centralwidget" native="true">
     <layout class="QHBoxLayout" name="horizontalLayout_2">
      <property name="leftMargin">
       <number>0</number>
      </property>
      <property name="topMargin">
       <number>0</number>
      </property>
      <property name="rightMargin">
       <number>0</number>
      </property>
      <property name="bottomMargin">
       <number>0</number>
      </property>
      <item>
       <widget class="QLineEdit" name="lineEdit_searchBar">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
          <horstretch>1</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="maximumSize">
         <size>
          <width>16777215</width>
          <height>41</height>
         </size>
        </property>
        <property name="font">
         <font>
          <family>Times New Roman</family>
          <pointsize>22</pointsize>
         </font>
        </property>
        <property name="styleSheet">
         <string notr="true">background: #3b3b3b;
color: #fff;</string>
        </property>
        <property name="placeholderText">
         <string>Write here...</string>
        </property>
       </widget>
      </item>
     </layout>
    </widget>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

如果要占满整个屏幕，那么就得计算屏幕的大小：

window.setFixedWidth(app.primaryScreen().availableSize().width())

PyQt 100% 宽度 window

PyQt 100% width window

python

qt

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