initial

.gitignore

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+.idea/
+*.iml
+out/
+*.jar

README.md

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+# Partial Navigation
+
+A plugin that allows one to set how many multiples of the screen each PageDown/PageUp button push scrolls.
+
+Idea stolen from here: https://stackoverflow.com/questions/27610249/intellij-idea-control-page-up-page-down-scroll-size
+
+## License
+
+`Partial Navigation` is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Partial Navigation by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.

resources/META-INF/plugin.xml

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+<idea-plugin>
+    <id>com.andreycizov.partialnav</id>
+    <name>Partial Navigation</name>
+    <version>1.0</version>
+    <vendor email="[email protected]" url="https://andreycizov.github.io/">Andrey Cizov</vendor>
+
+    <description><![CDATA[
+      Partial PageUp and PageDown navigation plugin
+    ]]></description>
+
+    <change-notes><![CDATA[
+      1.0: build the plugin for the first time
+    ]]>
+    </change-notes>
+
+    <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/build_number_ranges.html for description -->
+    <idea-version since-build="173.0"/>
+
+    <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
+         on how to target different products -->
+    <!-- uncomment to enable plugin in all products
+    <depends>com.intellij.modules.lang</depends>
+    -->
+    <extensions defaultExtensionNs="com.intellij">
+        <applicationConfigurable instance="com.andreycizov.partialnav.PartialNavConfigurable"/>
+    </extensions>
+
+    <actions>
+        <action id="PartialPageNav.PageUp" class="com.andreycizov.partialnav.PartialPageUpAction"
+                text="Partial Page _Up" description="Navigate a part of the screen up"/>
+        <action id="PartialPageNav.PageDown" class="com.andreycizov.partialnav.PartialPageDownAction"
+                text="Partial Page _Down" description="Navigate a part of the screen down"/>
+    </actions>
+
+</idea-plugin>

src/com/andreycizov/partialnav/PartialNavConfigurable.java

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+package com.andreycizov.partialnav;
+
+import com.intellij.ide.util.PropertiesComponent;
+import com.intellij.openapi.options.Configurable;
+import com.intellij.openapi.options.ConfigurationException;
+import org.jetbrains.annotations.Nls;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+
+public class PartialNavConfigurable implements Configurable {
+    private JPanel panelRoot;
+    private JComboBox comboPageUpMult;
+    private JComboBox comboPageDownMult;
+
+    @Nls(capitalization = Nls.Capitalization.Title)
+    @Override
+    public String getDisplayName() {
+        return "Partial Navigation";
+    }
+
+    public boolean isModified() {
+        return true;
+    }
+
+    @Nullable
+    @Override
+    public JComponent createComponent() {
+        float a = PropertiesComponent.getInstance().getFloat(PartialPageUpAction.propertyName, PartialPageUpAction.propertyDefault);
+        float b = PropertiesComponent.getInstance().getFloat(PartialPageDownAction.propertyName, PartialPageDownAction.propertyDefault);
+        comboPageUpMult.setSelectedItem(Float.toString(a));
+        comboPageDownMult.setSelectedItem(Float.toString(b));
+
+        return panelRoot;
+    }
+
+    @Nullable
+    @Override
+    public String getHelpTopic() {
+        return "com.andreycizov.partianav";
+    }
+
+    @Override
+    public void apply() throws ConfigurationException {
+        String pageUpMult = (String) comboPageUpMult.getSelectedItem();
+        String pageDownMult = (String) comboPageDownMult.getSelectedItem();
+
+        float fPageUpMult = Float.parseFloat(pageUpMult);
+        float fPageDownMult = Float.parseFloat(pageDownMult);
+
+        PropertiesComponent.getInstance().setValue(PartialPageUpAction.propertyName, fPageUpMult, PartialPageUpAction.propertyDefault);
+        PropertiesComponent.getInstance().setValue(PartialPageDownAction.propertyName, fPageDownMult, PartialPageDownAction.propertyDefault);
+    }
+}

src/com/andreycizov/partialnav/PartialNavConfigurableForm.form

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+<?xml version="1.0" encoding="UTF-8"?>
+<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="com.andreycizov.partialnav.PartialNavConfigurable">
+  <grid id="27dc6" binding="panelRoot" layout-manager="GridLayoutManager" row-count="2" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+    <margin top="0" left="0" bottom="0" right="0"/>
+    <constraints>
+      <xy x="20" y="20" width="500" height="400"/>
+    </constraints>
+    <properties/>
+    <border type="none"/>
+    <children>
+      <grid id="dd436" layout-manager="GridLayoutManager" row-count="2" column-count="3" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+        <margin top="0" left="0" bottom="0" right="0"/>
+        <constraints>
+          <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties/>
+        <border type="none"/>
+        <children>
+          <component id="7b41" class="javax.swing.JComboBox" binding="comboPageDownMult">
+            <constraints>
+              <grid row="1" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="2" anchor="8" fill="1" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties>
+              <model>
+                <item value="0.1"/>
+                <item value="0.15"/>
+                <item value="0.25"/>
+                <item value="0.5"/>
+                <item value="0.75"/>
+                <item value="1"/>
+                <item value="1.25"/>
+                <item value="1.5"/>
+              </model>
+            </properties>
+          </component>
+          <component id="9473a" class="javax.swing.JComboBox" binding="comboPageUpMult">
+            <constraints>
+              <grid row="0" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="2" anchor="8" fill="1" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties>
+              <model>
+                <item value="0.1"/>
+                <item value="0.15"/>
+                <item value="0.25"/>
+                <item value="0.5"/>
+                <item value="0.75"/>
+                <item value="1"/>
+                <item value="1.25"/>
+                <item value="1.5"/>
+              </model>
+            </properties>
+          </component>
+          <component id="6f49d" class="javax.swing.JLabel">
+            <constraints>
+              <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties>
+              <text value="Page Up Multiplier:"/>
+            </properties>
+          </component>
+          <component id="98673" class="javax.swing.JLabel">
+            <constraints>
+              <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties>
+              <text value="Page Down Multiplier:"/>
+            </properties>
+          </component>
+          <hspacer id="faee8">
+            <constraints>
+              <grid row="0" column="2" row-span="1" col-span="1" vsize-policy="1" hsize-policy="6" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+            </constraints>
+          </hspacer>
+          <hspacer id="4e73">
+            <constraints>
+              <grid row="1" column="2" row-span="1" col-span="1" vsize-policy="1" hsize-policy="6" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+            </constraints>
+          </hspacer>
+        </children>
+      </grid>
+      <vspacer id="12b41">
+        <constraints>
+          <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="6" hsize-policy="1" anchor="0" fill="2" indent="0" use-parent-layout="false"/>
+        </constraints>
+      </vspacer>
+    </children>
+  </grid>
+</form>

src/com/andreycizov/partialnav/PartialPageDownAction.java

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+package com.andreycizov.partialnav;
+
+import com.intellij.ide.util.PropertiesComponent;
+import com.intellij.openapi.actionSystem.DataContext;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.editor.actionSystem.EditorAction;
+import com.intellij.openapi.editor.actionSystem.EditorActionHandler;
+import org.jetbrains.annotations.NotNull;
+
+
+public class PartialPageDownAction extends EditorAction {
+    static String propertyName = "com.andreycizov.partialpagenav.mult.down";
+    static float propertyDefault = (float) 1.0;
+
+    public static class Handler extends EditorActionHandler {
+        public Handler() {
+            super(true);
+        }
+
+        @Override
+        public void execute(@NotNull Editor editor, DataContext dataContext) {
+            PartialPageNavHelper.moveCaretPageDown(
+                    editor,
+                    false,
+                    PropertiesComponent.getInstance().getFloat(propertyName, propertyDefault)
+            );
+        }
+
+        @Override
+        public boolean isEnabled(Editor editor, DataContext dataContext) {
+            return !editor.isOneLineMode();
+        }
+    }
+
+    public PartialPageDownAction() {
+        super(new Handler());
+    }
+}

src/com/andreycizov/partialnav/PartialPageNavHelper.java

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+package com.andreycizov.partialnav;
+
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.editor.ex.EditorEx;
+import com.intellij.util.SystemProperties;
+import org.jetbrains.annotations.NotNull;
+
+import java.awt.*;
+
+public class PartialPageNavHelper {
+    //  https://github.com/JetBrains/intellij-community/blob/5107d68347f99578759f406fb128bb0907b820ea/platform/platform-impl/src/com/intellij/openapi/editor/actions/EditorActionUtil.java#L791
+    static Rectangle getVisibleArea(@NotNull Editor editor) {
+        return SystemProperties.isTrueSmoothScrollingEnabled() ? editor.getScrollingModel().getVisibleAreaOnScrollingFinished()
+                : editor.getScrollingModel().getVisibleArea();
+    }
+
+    // https://github.com/JetBrains/intellij-community/blob/5107d68347f99578759f406fb128bb0907b820ea/platform/platform-impl/src/com/intellij/openapi/editor/actions/EditorActionUtil.java#L743
+    public static void moveCaretPageUp(@NotNull Editor editor, boolean isWithSelection, float mult) {
+        int lineHeight = editor.getLineHeight();
+        Rectangle visibleArea = getVisibleArea(editor);
+        int linesIncrement = (int) (visibleArea.height / lineHeight * mult);
+        editor.getScrollingModel().scrollVertically(visibleArea.y - visibleArea.y % lineHeight - linesIncrement * lineHeight);
+        int lineShift = -linesIncrement;
+        editor.getCaretModel().moveCaretRelatively(0, lineShift, isWithSelection, editor.isColumnMode(), true);
+    }
+
+    // https://github.com/JetBrains/intellij-community/blob/5107d68347f99578759f406fb128bb0907b820ea/platform/platform-impl/src/com/intellij/openapi/editor/actions/EditorActionUtil.java#L752
+    public static void moveCaretPageDown(@NotNull Editor editor, boolean isWithSelection, float mult) {
+        int lineHeight = editor.getLineHeight();
+        Rectangle visibleArea = getVisibleArea(editor);
+        int linesIncrement = (int) (visibleArea.height / lineHeight * mult);
+        int allowedBottom = ((EditorEx) editor).getContentSize().height - visibleArea.height;
+        editor.getScrollingModel().scrollVertically(
+                Math.min(allowedBottom, visibleArea.y - visibleArea.y % lineHeight + linesIncrement * lineHeight));
+        editor.getCaretModel().moveCaretRelatively(0, linesIncrement, isWithSelection, editor.isColumnMode(), true);
+    }
+}

src/com/andreycizov/partialnav/PartialPageUpAction.java

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+package com.andreycizov.partialnav;
+
+import com.intellij.ide.util.PropertiesComponent;
+import com.intellij.openapi.actionSystem.DataContext;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.editor.actionSystem.EditorAction;
+import com.intellij.openapi.editor.actionSystem.EditorActionHandler;
+import org.jetbrains.annotations.NotNull;
+
+
+public class PartialPageUpAction extends EditorAction {
+    static String propertyName = "com.andreycizov.partialpagenav.mult.up";
+    static float propertyDefault = (float) 1.0;
+
+    public static class Handler extends EditorActionHandler {
+        public Handler() {
+            super(true);
+        }
+
+        @Override
+        public void execute(@NotNull Editor editor, DataContext dataContext) {
+            PartialPageNavHelper.moveCaretPageUp(
+                    editor,
+                    false,
+                    PropertiesComponent.getInstance().getFloat(propertyName, propertyDefault)
+            );
+        }
+
+        @Override
+        public boolean isEnabled(Editor editor, DataContext dataContext) {
+            return !editor.isOneLineMode();
+        }
+    }
+
+    public PartialPageUpAction() {
+        super(new Handler());
+    }
+}