THPDFViewer Keyboard Navigation

Provides page navigation, scrolling, and zoom commands through the Viewer keyboard focus

Model method

function ProcessKeyInput(Key: Word; Shift: TShiftState): boolean;
function ProcessMouseWheel(WheelDelta: Integer; Shift: TShiftState): boolean;

The method returns True when the model handled the key and can be used without constructing a Viewer control

Shortcuts

• Page Up and Page Down move to the prior or next page
• Home and End move to the first or last page
• Shift+Up and Shift+Down move to the first or last page
• Ctrl++ and Ctrl+- zoom in or out
• Ctrl+1 selects Actual Size
• Ctrl+2 selects Fit Width
• Ctrl+3 selects Fit Page
• Unmodified arrow keys scroll the Viewer by 40 pixels without rerendering the page
• Ctrl+wheel zooms in or out
• The unmodified wheel scrolls vertically by the supplied delta
• Shift+wheel scrolls horizontally by the supplied delta

Focus

THPDFViewer.TabStop is enabled by default so normal form tab order can give the Viewer keyboard focus