UI: Update the filters window to be resizeable

Updates the filters window to use a QSplitter layout for the properties area.

The handle is disabled for audio filter windows. The handle and property area are hidden when there are no filters.

UI/forms/OBSBasicFilters.ui

@@ -437,45 +437,152 @@
       </layout>
      </item>
      <item>
-      <layout class="QVBoxLayout" name="rightContainerLayout">
-       <item>
-        <layout class="QVBoxLayout" name="rightLayout">
-         <item>
-          <widget class="OBSQTDisplay" name="preview" native="true">
+      <widget class="QFrame" name="rightContainerLayout">
+       <property name="minimumSize">
+        <size>
+         <width>200</width>
+         <height>0</height>
+        </size>
+       </property>
+       <property name="frameShape">
+        <enum>QFrame::NoFrame</enum>
+       </property>
+       <property name="frameShadow">
+        <enum>QFrame::Plain</enum>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout_6">
+        <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="QSplitter" name="rightLayout">
+          <property name="minimumSize">
+           <size>
+            <width>0</width>
+            <height>400</height>
+           </size>
+          </property>
+          <property name="orientation">
+           <enum>Qt::Vertical</enum>
+          </property>
+          <widget class="QFrame" name="previewFrame">
            <property name="sizePolicy">
-            <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+            <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
-           <property name="minimumSize">
-            <size>
-             <width>24</width>
-             <height>24</height>
-            </size>
+           <property name="frameShape">
+            <enum>QFrame::NoFrame</enum>
            </property>
+           <property name="frameShadow">
+            <enum>QFrame::Plain</enum>
+           </property>
+           <layout class="QVBoxLayout" name="verticalLayout_7">
+            <property name="spacing">
+             <number>0</number>
+            </property>
+            <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="OBSQTDisplay" name="preview" native="true">
+              <property name="sizePolicy">
+               <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+                <horstretch>0</horstretch>
+                <verstretch>0</verstretch>
+               </sizepolicy>
+              </property>
+              <property name="minimumSize">
+               <size>
+                <width>0</width>
+                <height>150</height>
+               </size>
+              </property>
+             </widget>
+            </item>
+           </layout>
           </widget>
-         </item>
-        </layout>
-       </item>
-       <item>
-        <layout class="QHBoxLayout" name="horizontalLayout_2">
-         <property name="spacing">
-          <number>4</number>
-         </property>
-         <property name="sizeConstraint">
-          <enum>QLayout::SetMaximumSize</enum>
-         </property>
-         <item>
-          <widget class="QDialogButtonBox" name="buttonBox">
-           <property name="standardButtons">
-            <set>QDialogButtonBox::Close|QDialogButtonBox::Reset</set>
+          <widget class="QFrame" name="propertiesFrame">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="frameShape">
+            <enum>QFrame::NoFrame</enum>
            </property>
+           <property name="frameShadow">
+            <enum>QFrame::Plain</enum>
+           </property>
+           <layout class="QVBoxLayout" name="propertiesLayout">
+            <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>
+           </layout>
           </widget>
-         </item>
-        </layout>
-       </item>
-      </layout>
+         </widget>
+        </item>
+        <item>
+         <layout class="QHBoxLayout" name="horizontalLayout_2">
+          <property name="spacing">
+           <number>4</number>
+          </property>
+          <property name="sizeConstraint">
+           <enum>QLayout::SetMaximumSize</enum>
+          </property>
+          <item>
+           <spacer name="horizontalSpacer">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>0</width>
+              <height>0</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+          <item>
+           <widget class="QDialogButtonBox" name="buttonBox">
+            <property name="standardButtons">
+             <set>QDialogButtonBox::Close|QDialogButtonBox::Reset</set>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
+       </layout>
+      </widget>
      </item>
     </layout>
    </item>

UI/window-basic-filters.cpp

@@ -119,6 +119,7 @@ OBSBasicFilters::OBSBasicFilters(QWidget *parent, OBSSource source_)
 	if (audioOnly) {
 		ui->effectWidget->setVisible(false);
 		ui->separatorLine->setVisible(false);
+		UpdateSplitter(false);
 	}
 
 	if (async && !audioOnly && ui->asyncFilters->count() == 0 &&
@@ -129,6 +130,12 @@ OBSBasicFilters::OBSBasicFilters(QWidget *parent, OBSSource source_)
 	if (audioOnly || (audio && !async))
 		ui->asyncLabel->setText(QTStr("Basic.Filters.AudioFilters"));
 
+	if (async && audio && ui->asyncFilters->count() == 0) {
+		UpdateSplitter(false);
+	} else if (!audioOnly) {
+		UpdateSplitter();
+	}
+
 	auto addDrawCallback = [this]() {
 		obs_display_add_draw_callback(ui->preview->GetDisplay(),
 					      OBSBasicFilters::DrawPreview,
@@ -147,7 +154,6 @@ OBSBasicFilters::OBSBasicFilters(QWidget *parent, OBSSource source_)
 				addDrawCallback);
 	} else {
 		ui->rightLayout->setContentsMargins(0, noPreviewMargin, 0, 0);
-		ui->rightContainerLayout->insertStretch(1);
 		ui->preview->hide();
 	}
 
@@ -255,7 +261,8 @@ void OBSBasicFilters::UpdatePropertiesView(int row, bool async)
 {
 	if (view) {
 		updatePropertiesSignal.Disconnect();
-		ui->rightLayout->removeWidget(view);
+		ui->propertiesFrame->setVisible(false);
+		view->hide();
 		view->deleteLater();
 		view = nullptr;
 	}
@@ -284,9 +291,9 @@ void OBSBasicFilters::UpdatePropertiesView(int row, bool async)
 				       "update_properties",
 				       OBSBasicFilters::UpdateProperties, this);
 
-	view->setMaximumHeight(250);
 	view->setMinimumHeight(150);
-	ui->rightLayout->addWidget(view);
+	UpdateSplitter();
+	ui->propertiesLayout->addWidget(view);
 	view->show();
 }
 
@@ -438,6 +445,28 @@ void OBSBasicFilters::UpdateFilters()
 	main->SaveProject();
 }
 
+void OBSBasicFilters::UpdateSplitter()
+{
+	bool show_splitter_frame =
+		ui->asyncFilters->count() + ui->effectFilters->count() > 0;
+	UpdateSplitter(show_splitter_frame);
+}
+
+void OBSBasicFilters::UpdateSplitter(bool show_splitter_frame)
+{
+	bool show_splitter_handle = show_splitter_frame;
+	uint32_t caps = obs_source_get_output_flags(source);
+	if ((caps & OBS_SOURCE_VIDEO) == 0)
+		show_splitter_handle = false;
+
+	for (int i = 0; i < ui->rightLayout->count(); i++) {
+		QSplitterHandle *hndl = ui->rightLayout->handle(i);
+		hndl->setEnabled(show_splitter_handle);
+	}
+
+	ui->propertiesFrame->setVisible(show_splitter_frame);
+}
+
 static bool filter_compatible(bool async, uint32_t sourceFlags,
 			      uint32_t filterFlags)
 {

UI/window-basic-filters.hpp

@@ -50,6 +50,8 @@ private:
 	inline OBSSource GetFilter(int row, bool async);
 
 	void UpdateFilters();
+	void UpdateSplitter();
+	void UpdateSplitter(bool show_splitter_frame);
 	void UpdatePropertiesView(int row, bool async);
 
 	static void OBSSourceFilterAdded(void *param, calldata_t *data);